26 files changed, 9508 insertions, 0 deletions

diff --git a/app/gui/Makefile.am b/app/gui/Makefile.am
new file mode 100644
index 0000000..579cd63
--- /dev/null
+++ b/app/gui/Makefile.am
@@ -0,0 +1,80 @@
+## Process this file with automake to produce Makefile.in
+
+if PLATFORM_OSX
+xobjective_c = "-xobjective-c"
+xobjective_cxx = "-xobjective-c++"
+xnone = "-xnone"
+endif
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-GUI\"		\
+	-DGIMP_COMMAND=\"@GIMP_COMMAND@\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(GIO_UNIX_CFLAGS)			\
+	$(GEGL_CFLAGS)				\
+	$(GTK_CFLAGS)				\
+	$(GTK_MAC_INTEGRATION_CFLAGS)		\
+	-I$(includedir)
+
+AM_CFLAGS = \
+	$(xobjective_c)
+
+AM_CXXFLAGS = \
+	$(xobjective_cxx)
+
+AM_LDFLAGS = \
+	$(xnone)
+
+noinst_LIBRARIES = libappgui.a
+
+libappgui_a_sources = \
+	gimpdbusservice.c	\
+	gimpdbusservice.h	\
+	gimpuiconfigurer.c	\
+	gimpuiconfigurer.h	\
+	gui.c			\
+	gui.h			\
+	gui-message.c		\
+	gui-message.h		\
+	gui-unique.c		\
+	gui-unique.h		\
+	gui-vtable.c		\
+	gui-vtable.h		\
+	gui-types.h		\
+	icon-themes.c		\
+	icon-themes.h		\
+	session.c		\
+	session.h		\
+	splash.c		\
+	splash.h		\
+	themes.c		\
+	themes.h
+
+libappgui_a_built_sources = \
+	gimpdbusservice-generated.c	\
+	gimpdbusservice-generated.h
+
+libappgui_a_SOURCES = $(libappgui_a_built_sources) $(libappgui_a_sources)
+
+BUILT_SOURCES = $(libappgui_a_built_sources)
+
+EXTRA_DIST = \
+	dbus-service.xml
+
+#
+# rules to generate built sources
+#
+# setup autogeneration dependencies
+gen_sources = $(libappgui_a_built_sources)
+CLEANFILES = $(gen_sources)
+
+$(srcdir)/gimpdbusservice.c: $(libappgui_a_built_sources)
+
+$(libappgui_a_built_sources): $(srcdir)/dbus-service.xml
+	$(GDBUS_CODEGEN) --interface-prefix org.gimp.GIMP. \
+			 --generate-c-code gimpdbusservice-generated \
+			 --c-namespace GimpDBusService \
+			 $(srcdir)/dbus-service.xml
diff --git a/app/gui/Makefile.in b/app/gui/Makefile.in
new file mode 100644
index 0000000..d26b820
--- /dev/null
+++ b/app/gui/Makefile.in
@@ -0,0 +1,1016 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = app/gui
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/m4macros/gtk-doc.m4 \
+	$(top_srcdir)/m4macros/intltool.m4 \
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+	$(top_srcdir)/m4macros/ltoptions.m4 \
+	$(top_srcdir)/m4macros/ltsugar.m4 \
+	$(top_srcdir)/m4macros/ltversion.m4 \
+	$(top_srcdir)/m4macros/lt~obsolete.m4 \
+	$(top_srcdir)/acinclude.m4 $(top_srcdir)/m4macros/alsa.m4 \
+	$(top_srcdir)/m4macros/ax_compare_version.m4 \
+	$(top_srcdir)/m4macros/ax_cxx_compile_stdcxx.m4 \
+	$(top_srcdir)/m4macros/ax_gcc_func_attribute.m4 \
+	$(top_srcdir)/m4macros/ax_prog_cc_for_build.m4 \
+	$(top_srcdir)/m4macros/ax_prog_perl_version.m4 \
+	$(top_srcdir)/m4macros/detectcflags.m4 \
+	$(top_srcdir)/m4macros/pythondev.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+LIBRARIES = $(noinst_LIBRARIES)
+ARFLAGS = cru
+AM_V_AR = $(am__v_AR_@AM_V@)
+am__v_AR_ = $(am__v_AR_@AM_DEFAULT_V@)
+am__v_AR_0 = @echo "  AR      " $@;
+am__v_AR_1 = 
+libappgui_a_AR = $(AR) $(ARFLAGS)
+libappgui_a_LIBADD =
+am__objects_1 = gimpdbusservice-generated.$(OBJEXT)
+am__objects_2 = gimpdbusservice.$(OBJEXT) gimpuiconfigurer.$(OBJEXT) \
+	gui.$(OBJEXT) gui-message.$(OBJEXT) gui-unique.$(OBJEXT) \
+	gui-vtable.$(OBJEXT) icon-themes.$(OBJEXT) session.$(OBJEXT) \
+	splash.$(OBJEXT) themes.$(OBJEXT)
+am_libappgui_a_OBJECTS = $(am__objects_1) $(am__objects_2)
+libappgui_a_OBJECTS = $(am_libappgui_a_OBJECTS)
+AM_V_P = $(am__v_P_@AM_V@)
+am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)
+am__v_P_0 = false
+am__v_P_1 = :
+AM_V_GEN = $(am__v_GEN_@AM_V@)
+am__v_GEN_ = $(am__v_GEN_@AM_DEFAULT_V@)
+am__v_GEN_0 = @echo "  GEN     " $@;
+am__v_GEN_1 = 
+AM_V_at = $(am__v_at_@AM_V@)
+am__v_at_ = $(am__v_at_@AM_DEFAULT_V@)
+am__v_at_0 = @
+am__v_at_1 = 
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
+depcomp = $(SHELL) $(top_srcdir)/depcomp
+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/gimpdbusservice-generated.Po \
+	./$(DEPDIR)/gimpdbusservice.Po ./$(DEPDIR)/gimpuiconfigurer.Po \
+	./$(DEPDIR)/gui-message.Po ./$(DEPDIR)/gui-unique.Po \
+	./$(DEPDIR)/gui-vtable.Po ./$(DEPDIR)/gui.Po \
+	./$(DEPDIR)/icon-themes.Po ./$(DEPDIR)/session.Po \
+	./$(DEPDIR)/splash.Po ./$(DEPDIR)/themes.Po
+am__mv = mv -f
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
+am__v_lt_1 = 
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_@AM_V@)
+am__v_CC_ = $(am__v_CC_@AM_DEFAULT_V@)
+am__v_CC_0 = @echo "  CC      " $@;
+am__v_CC_1 = 
+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_@AM_V@)
+am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
+am__v_CCLD_0 = @echo "  CCLD    " $@;
+am__v_CCLD_1 = 
+SOURCES = $(libappgui_a_SOURCES)
+DIST_SOURCES = $(libappgui_a_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
+    *) (install-info --version) >/dev/null 2>&1;; \
+  esac
+am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP)
+# Read a list of newline-separated strings from the standard input,
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+am__uniquify_input = $(AWK) '\
+  BEGIN { nonempty = 0; } \
+  { items[$$0] = 1; nonempty = 1; } \
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+'
+# Make sure the list of sources is unique.  This is necessary because,
+# e.g., the same source file might be shared among _SOURCES variables
+# for different programs/libraries.
+am__define_uniq_tagged_files = \
+  list='$(am__tagged_files)'; \
+  unique=`for i in $$list; do \
+    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+  done | $(am__uniquify_input)`
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+MIME_INFO_LIBS = @MIME_INFO_LIBS@
+MIME_TYPES = @MIME_TYPES@
+MKDIR_P = @MKDIR_P@
+MKINSTALLDIRS = @MKINSTALLDIRS@
+MMX_EXTRA_CFLAGS = @MMX_EXTRA_CFLAGS@
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+MNG_LIBS = @MNG_LIBS@
+MSGFMT = @MSGFMT@
+MSGFMT_OPTS = @MSGFMT_OPTS@
+MSGMERGE = @MSGMERGE@
+MYPAINT_BRUSHES_CFLAGS = @MYPAINT_BRUSHES_CFLAGS@
+MYPAINT_BRUSHES_LIBS = @MYPAINT_BRUSHES_LIBS@
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+NATIVE_GLIB_LIBS = @NATIVE_GLIB_LIBS@
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+OPENJPEG_REQUIRED_VERSION = @OPENJPEG_REQUIRED_VERSION@
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+@PLATFORM_OSX_TRUE@xobjective_c = "-xobjective-c"
+@PLATFORM_OSX_TRUE@xobjective_cxx = "-xobjective-c++"
+@PLATFORM_OSX_TRUE@xnone = "-xnone"
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-GUI\"		\
+	-DGIMP_COMMAND=\"@GIMP_COMMAND@\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(GIO_UNIX_CFLAGS)			\
+	$(GEGL_CFLAGS)				\
+	$(GTK_CFLAGS)				\
+	$(GTK_MAC_INTEGRATION_CFLAGS)		\
+	-I$(includedir)
+
+AM_CFLAGS = \
+	$(xobjective_c)
+
+AM_CXXFLAGS = \
+	$(xobjective_cxx)
+
+AM_LDFLAGS = \
+	$(xnone)
+
+noinst_LIBRARIES = libappgui.a
+libappgui_a_sources = \
+	gimpdbusservice.c	\
+	gimpdbusservice.h	\
+	gimpuiconfigurer.c	\
+	gimpuiconfigurer.h	\
+	gui.c			\
+	gui.h			\
+	gui-message.c		\
+	gui-message.h		\
+	gui-unique.c		\
+	gui-unique.h		\
+	gui-vtable.c		\
+	gui-vtable.h		\
+	gui-types.h		\
+	icon-themes.c		\
+	icon-themes.h		\
+	session.c		\
+	session.h		\
+	splash.c		\
+	splash.h		\
+	themes.c		\
+	themes.h
+
+libappgui_a_built_sources = \
+	gimpdbusservice-generated.c	\
+	gimpdbusservice-generated.h
+
+libappgui_a_SOURCES = $(libappgui_a_built_sources) $(libappgui_a_sources)
+BUILT_SOURCES = $(libappgui_a_built_sources)
+EXTRA_DIST = \
+	dbus-service.xml
+
+
+#
+# rules to generate built sources
+#
+# setup autogeneration dependencies
+gen_sources = $(libappgui_a_built_sources)
+CLEANFILES = $(gen_sources)
+all: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu app/gui/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu app/gui/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-noinstLIBRARIES:
+	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+
+libappgui.a: $(libappgui_a_OBJECTS) $(libappgui_a_DEPENDENCIES) $(EXTRA_libappgui_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libappgui.a
+	$(AM_V_AR)$(libappgui_a_AR) libappgui.a $(libappgui_a_OBJECTS) $(libappgui_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libappgui.a
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpdbusservice-generated.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpdbusservice.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpuiconfigurer.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gui-message.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gui-unique.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gui-vtable.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gui.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/icon-themes.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/session.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/splash.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/themes.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) check-am
+all-am: Makefile $(LIBRARIES)
+installdirs:
+install: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(BUILT_SOURCES)" || rm -f $(BUILT_SOURCES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/gimpdbusservice-generated.Po
+	-rm -f ./$(DEPDIR)/gimpdbusservice.Po
+	-rm -f ./$(DEPDIR)/gimpuiconfigurer.Po
+	-rm -f ./$(DEPDIR)/gui-message.Po
+	-rm -f ./$(DEPDIR)/gui-unique.Po
+	-rm -f ./$(DEPDIR)/gui-vtable.Po
+	-rm -f ./$(DEPDIR)/gui.Po
+	-rm -f ./$(DEPDIR)/icon-themes.Po
+	-rm -f ./$(DEPDIR)/session.Po
+	-rm -f ./$(DEPDIR)/splash.Po
+	-rm -f ./$(DEPDIR)/themes.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/gimpdbusservice-generated.Po
+	-rm -f ./$(DEPDIR)/gimpdbusservice.Po
+	-rm -f ./$(DEPDIR)/gimpuiconfigurer.Po
+	-rm -f ./$(DEPDIR)/gui-message.Po
+	-rm -f ./$(DEPDIR)/gui-unique.Po
+	-rm -f ./$(DEPDIR)/gui-vtable.Po
+	-rm -f ./$(DEPDIR)/gui.Po
+	-rm -f ./$(DEPDIR)/icon-themes.Po
+	-rm -f ./$(DEPDIR)/session.Po
+	-rm -f ./$(DEPDIR)/splash.Po
+	-rm -f ./$(DEPDIR)/themes.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: all check install install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+$(srcdir)/gimpdbusservice.c: $(libappgui_a_built_sources)
+
+$(libappgui_a_built_sources): $(srcdir)/dbus-service.xml
+	$(GDBUS_CODEGEN) --interface-prefix org.gimp.GIMP. \
+			 --generate-c-code gimpdbusservice-generated \
+			 --c-namespace GimpDBusService \
+			 $(srcdir)/dbus-service.xml
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/app/gui/dbus-service.xml b/app/gui/dbus-service.xml
new file mode 100644
index 0000000..5badd9b
--- /dev/null
+++ b/app/gui/dbus-service.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+
+<node>
+
+  <interface name="org.gimp.GIMP.UI">
+
+    <method name="Open">
+      <arg type="s" name="uri" direction="in" />
+      <arg type="b" name="success" direction="out" />
+    </method>
+
+    <method name="OpenAsNew">
+      <arg type="s" name="uri" direction="in" />
+      <arg type="b" name="success" direction="out" />
+    </method>
+
+    <method name="BatchRun">
+      <arg type="s" name="interpreter" direction="in" />
+      <arg type="s" name="command" direction="in" />
+      <arg type="b" name="success" direction="out" />
+    </method>
+
+    <method name="Activate" />
+
+    <signal name="Opened">
+      <arg type="s" name="uri" />
+    </signal>
+
+  </interface>
+
+</node>
diff --git a/app/gui/gimpdbusservice-generated.c b/app/gui/gimpdbusservice-generated.c
new file mode 100644
index 0000000..ab4649d
--- /dev/null
+++ b/app/gui/gimpdbusservice-generated.c
@@ -0,0 +1,1721 @@
+/*
+ * This file is generated by gdbus-codegen, do not modify it.
+ *
+ * The license of this code is the same as for the D-Bus interface description
+ * it was derived from. Note that it links to GLib, so must comply with the
+ * LGPL linking clauses.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "gimpdbusservice-generated.h"
+
+#include <string.h>
+#ifdef G_OS_UNIX
+#  include <gio/gunixfdlist.h>
+#endif
+
+typedef struct
+{
+  GDBusArgInfo parent_struct;
+  gboolean use_gvariant;
+} _ExtendedGDBusArgInfo;
+
+typedef struct
+{
+  GDBusMethodInfo parent_struct;
+  const gchar *signal_name;
+  gboolean pass_fdlist;
+} _ExtendedGDBusMethodInfo;
+
+typedef struct
+{
+  GDBusSignalInfo parent_struct;
+  const gchar *signal_name;
+} _ExtendedGDBusSignalInfo;
+
+typedef struct
+{
+  GDBusPropertyInfo parent_struct;
+  const gchar *hyphen_name;
+  guint use_gvariant : 1;
+  guint emits_changed_signal : 1;
+} _ExtendedGDBusPropertyInfo;
+
+typedef struct
+{
+  GDBusInterfaceInfo parent_struct;
+  const gchar *hyphen_name;
+} _ExtendedGDBusInterfaceInfo;
+
+typedef struct
+{
+  const _ExtendedGDBusPropertyInfo *info;
+  guint prop_id;
+  GValue orig_value; /* the value before the change */
+} ChangedProperty;
+
+static void
+_changed_property_free (ChangedProperty *data)
+{
+  g_value_unset (&data->orig_value);
+  g_free (data);
+}
+
+static gboolean
+_g_strv_equal0 (gchar **a, gchar **b)
+{
+  gboolean ret = FALSE;
+  guint n;
+  if (a == NULL && b == NULL)
+    {
+      ret = TRUE;
+      goto out;
+    }
+  if (a == NULL || b == NULL)
+    goto out;
+  if (g_strv_length (a) != g_strv_length (b))
+    goto out;
+  for (n = 0; a[n] != NULL; n++)
+    if (g_strcmp0 (a[n], b[n]) != 0)
+      goto out;
+  ret = TRUE;
+out:
+  return ret;
+}
+
+static gboolean
+_g_variant_equal0 (GVariant *a, GVariant *b)
+{
+  gboolean ret = FALSE;
+  if (a == NULL && b == NULL)
+    {
+      ret = TRUE;
+      goto out;
+    }
+  if (a == NULL || b == NULL)
+    goto out;
+  ret = g_variant_equal (a, b);
+out:
+  return ret;
+}
+
+G_GNUC_UNUSED static gboolean
+_g_value_equal (const GValue *a, const GValue *b)
+{
+  gboolean ret = FALSE;
+  g_assert (G_VALUE_TYPE (a) == G_VALUE_TYPE (b));
+  switch (G_VALUE_TYPE (a))
+    {
+      case G_TYPE_BOOLEAN:
+        ret = (g_value_get_boolean (a) == g_value_get_boolean (b));
+        break;
+      case G_TYPE_UCHAR:
+        ret = (g_value_get_uchar (a) == g_value_get_uchar (b));
+        break;
+      case G_TYPE_INT:
+        ret = (g_value_get_int (a) == g_value_get_int (b));
+        break;
+      case G_TYPE_UINT:
+        ret = (g_value_get_uint (a) == g_value_get_uint (b));
+        break;
+      case G_TYPE_INT64:
+        ret = (g_value_get_int64 (a) == g_value_get_int64 (b));
+        break;
+      case G_TYPE_UINT64:
+        ret = (g_value_get_uint64 (a) == g_value_get_uint64 (b));
+        break;
+      case G_TYPE_DOUBLE:
+        {
+          /* Avoid -Wfloat-equal warnings by doing a direct bit compare */
+          gdouble da = g_value_get_double (a);
+          gdouble db = g_value_get_double (b);
+          ret = memcmp (&da, &db, sizeof (gdouble)) == 0;
+        }
+        break;
+      case G_TYPE_STRING:
+        ret = (g_strcmp0 (g_value_get_string (a), g_value_get_string (b)) == 0);
+        break;
+      case G_TYPE_VARIANT:
+        ret = _g_variant_equal0 (g_value_get_variant (a), g_value_get_variant (b));
+        break;
+      default:
+        if (G_VALUE_TYPE (a) == G_TYPE_STRV)
+          ret = _g_strv_equal0 (g_value_get_boxed (a), g_value_get_boxed (b));
+        else
+          g_critical ("_g_value_equal() does not handle type %s", g_type_name (G_VALUE_TYPE (a)));
+        break;
+    }
+  return ret;
+}
+
+/* ------------------------------------------------------------------------
+ * Code for interface org.gimp.GIMP.UI
+ * ------------------------------------------------------------------------
+ */
+
+/**
+ * SECTION:GimpDBusServiceUI
+ * @title: GimpDBusServiceUI
+ * @short_description: Generated C code for the org.gimp.GIMP.UI D-Bus interface
+ *
+ * This section contains code for working with the <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link> D-Bus interface in C.
+ */
+
+/* ---- Introspection data for org.gimp.GIMP.UI ---- */
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_open_IN_ARG_uri =
+{
+  {
+    -1,
+    (gchar *) "uri",
+    (gchar *) "s",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_open_IN_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_open_IN_ARG_uri.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_open_OUT_ARG_success =
+{
+  {
+    -1,
+    (gchar *) "success",
+    (gchar *) "b",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_open_OUT_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_open_OUT_ARG_success.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusMethodInfo _gimp_dbus_service_ui_method_info_open =
+{
+  {
+    -1,
+    (gchar *) "Open",
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_open_IN_ARG_pointers,
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_open_OUT_ARG_pointers,
+    NULL
+  },
+  "handle-open",
+  FALSE
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_open_as_new_IN_ARG_uri =
+{
+  {
+    -1,
+    (gchar *) "uri",
+    (gchar *) "s",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_open_as_new_IN_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_open_as_new_IN_ARG_uri.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_open_as_new_OUT_ARG_success =
+{
+  {
+    -1,
+    (gchar *) "success",
+    (gchar *) "b",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_open_as_new_OUT_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_open_as_new_OUT_ARG_success.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusMethodInfo _gimp_dbus_service_ui_method_info_open_as_new =
+{
+  {
+    -1,
+    (gchar *) "OpenAsNew",
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_open_as_new_IN_ARG_pointers,
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_open_as_new_OUT_ARG_pointers,
+    NULL
+  },
+  "handle-open-as-new",
+  FALSE
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_batch_run_IN_ARG_interpreter =
+{
+  {
+    -1,
+    (gchar *) "interpreter",
+    (gchar *) "s",
+    NULL
+  },
+  FALSE
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_batch_run_IN_ARG_command =
+{
+  {
+    -1,
+    (gchar *) "command",
+    (gchar *) "s",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_batch_run_IN_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_batch_run_IN_ARG_interpreter.parent_struct,
+  &_gimp_dbus_service_ui_method_info_batch_run_IN_ARG_command.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_method_info_batch_run_OUT_ARG_success =
+{
+  {
+    -1,
+    (gchar *) "success",
+    (gchar *) "b",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_method_info_batch_run_OUT_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_batch_run_OUT_ARG_success.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusMethodInfo _gimp_dbus_service_ui_method_info_batch_run =
+{
+  {
+    -1,
+    (gchar *) "BatchRun",
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_batch_run_IN_ARG_pointers,
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_method_info_batch_run_OUT_ARG_pointers,
+    NULL
+  },
+  "handle-batch-run",
+  FALSE
+};
+
+static const _ExtendedGDBusMethodInfo _gimp_dbus_service_ui_method_info_activate =
+{
+  {
+    -1,
+    (gchar *) "Activate",
+    NULL,
+    NULL,
+    NULL
+  },
+  "handle-activate",
+  FALSE
+};
+
+static const GDBusMethodInfo * const _gimp_dbus_service_ui_method_info_pointers[] =
+{
+  &_gimp_dbus_service_ui_method_info_open.parent_struct,
+  &_gimp_dbus_service_ui_method_info_open_as_new.parent_struct,
+  &_gimp_dbus_service_ui_method_info_batch_run.parent_struct,
+  &_gimp_dbus_service_ui_method_info_activate.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusArgInfo _gimp_dbus_service_ui_signal_info_opened_ARG_uri =
+{
+  {
+    -1,
+    (gchar *) "uri",
+    (gchar *) "s",
+    NULL
+  },
+  FALSE
+};
+
+static const GDBusArgInfo * const _gimp_dbus_service_ui_signal_info_opened_ARG_pointers[] =
+{
+  &_gimp_dbus_service_ui_signal_info_opened_ARG_uri.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusSignalInfo _gimp_dbus_service_ui_signal_info_opened =
+{
+  {
+    -1,
+    (gchar *) "Opened",
+    (GDBusArgInfo **) &_gimp_dbus_service_ui_signal_info_opened_ARG_pointers,
+    NULL
+  },
+  "opened"
+};
+
+static const GDBusSignalInfo * const _gimp_dbus_service_ui_signal_info_pointers[] =
+{
+  &_gimp_dbus_service_ui_signal_info_opened.parent_struct,
+  NULL
+};
+
+static const _ExtendedGDBusInterfaceInfo _gimp_dbus_service_ui_interface_info =
+{
+  {
+    -1,
+    (gchar *) "org.gimp.GIMP.UI",
+    (GDBusMethodInfo **) &_gimp_dbus_service_ui_method_info_pointers,
+    (GDBusSignalInfo **) &_gimp_dbus_service_ui_signal_info_pointers,
+    NULL,
+    NULL
+  },
+  "ui",
+};
+
+
+/**
+ * gimp_dbus_service_ui_interface_info:
+ *
+ * Gets a machine-readable description of the <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link> D-Bus interface.
+ *
+ * Returns: (transfer none): A #GDBusInterfaceInfo. Do not free.
+ */
+GDBusInterfaceInfo *
+gimp_dbus_service_ui_interface_info (void)
+{
+  return (GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct;
+}
+
+/**
+ * gimp_dbus_service_ui_override_properties:
+ * @klass: The class structure for a #GObject derived class.
+ * @property_id_begin: The property id to assign to the first overridden property.
+ *
+ * Overrides all #GObject properties in the #GimpDBusServiceUI interface for a concrete class.
+ * The properties are overridden in the order they are defined.
+ *
+ * Returns: The last property id.
+ */
+guint
+gimp_dbus_service_ui_override_properties (GObjectClass *klass, guint property_id_begin)
+{
+  return property_id_begin - 1;
+}
+
+
+
+/**
+ * GimpDBusServiceUI:
+ *
+ * Abstract interface type for the D-Bus interface <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link>.
+ */
+
+/**
+ * GimpDBusServiceUIIface:
+ * @parent_iface: The parent interface.
+ * @handle_activate: Handler for the #GimpDBusServiceUI::handle-activate signal.
+ * @handle_batch_run: Handler for the #GimpDBusServiceUI::handle-batch-run signal.
+ * @handle_open: Handler for the #GimpDBusServiceUI::handle-open signal.
+ * @handle_open_as_new: Handler for the #GimpDBusServiceUI::handle-open-as-new signal.
+ * @opened: Handler for the #GimpDBusServiceUI::opened signal.
+ *
+ * Virtual table for the D-Bus interface <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link>.
+ */
+
+typedef GimpDBusServiceUIIface GimpDBusServiceUIInterface;
+G_DEFINE_INTERFACE (GimpDBusServiceUI, gimp_dbus_service_ui, G_TYPE_OBJECT)
+
+static void
+gimp_dbus_service_ui_default_init (GimpDBusServiceUIIface *iface)
+{
+  /* GObject signals for incoming D-Bus method calls: */
+  /**
+   * GimpDBusServiceUI::handle-open:
+   * @object: A #GimpDBusServiceUI.
+   * @invocation: A #GDBusMethodInvocation.
+   * @arg_uri: Argument passed by remote caller.
+   *
+   * Signal emitted when a remote caller is invoking the <link linkend="gdbus-method-org-gimp-GIMP-UI.Open">Open()</link> D-Bus method.
+   *
+   * If a signal handler returns %TRUE, it means the signal handler will handle the invocation (e.g. take a reference to @invocation and eventually call gimp_dbus_service_ui_complete_open() or e.g. g_dbus_method_invocation_return_error() on it) and no order signal handlers will run. If no signal handler handles the invocation, the %G_DBUS_ERROR_UNKNOWN_METHOD error is returned.
+   *
+   * Returns: %TRUE if the invocation was handled, %FALSE to let other signal handlers run.
+   */
+  g_signal_new ("handle-open",
+    G_TYPE_FROM_INTERFACE (iface),
+    G_SIGNAL_RUN_LAST,
+    G_STRUCT_OFFSET (GimpDBusServiceUIIface, handle_open),
+    g_signal_accumulator_true_handled,
+    NULL,
+    g_cclosure_marshal_generic,
+    G_TYPE_BOOLEAN,
+    2,
+    G_TYPE_DBUS_METHOD_INVOCATION, G_TYPE_STRING);
+
+  /**
+   * GimpDBusServiceUI::handle-open-as-new:
+   * @object: A #GimpDBusServiceUI.
+   * @invocation: A #GDBusMethodInvocation.
+   * @arg_uri: Argument passed by remote caller.
+   *
+   * Signal emitted when a remote caller is invoking the <link linkend="gdbus-method-org-gimp-GIMP-UI.OpenAsNew">OpenAsNew()</link> D-Bus method.
+   *
+   * If a signal handler returns %TRUE, it means the signal handler will handle the invocation (e.g. take a reference to @invocation and eventually call gimp_dbus_service_ui_complete_open_as_new() or e.g. g_dbus_method_invocation_return_error() on it) and no order signal handlers will run. If no signal handler handles the invocation, the %G_DBUS_ERROR_UNKNOWN_METHOD error is returned.
+   *
+   * Returns: %TRUE if the invocation was handled, %FALSE to let other signal handlers run.
+   */
+  g_signal_new ("handle-open-as-new",
+    G_TYPE_FROM_INTERFACE (iface),
+    G_SIGNAL_RUN_LAST,
+    G_STRUCT_OFFSET (GimpDBusServiceUIIface, handle_open_as_new),
+    g_signal_accumulator_true_handled,
+    NULL,
+    g_cclosure_marshal_generic,
+    G_TYPE_BOOLEAN,
+    2,
+    G_TYPE_DBUS_METHOD_INVOCATION, G_TYPE_STRING);
+
+  /**
+   * GimpDBusServiceUI::handle-batch-run:
+   * @object: A #GimpDBusServiceUI.
+   * @invocation: A #GDBusMethodInvocation.
+   * @arg_interpreter: Argument passed by remote caller.
+   * @arg_command: Argument passed by remote caller.
+   *
+   * Signal emitted when a remote caller is invoking the <link linkend="gdbus-method-org-gimp-GIMP-UI.BatchRun">BatchRun()</link> D-Bus method.
+   *
+   * If a signal handler returns %TRUE, it means the signal handler will handle the invocation (e.g. take a reference to @invocation and eventually call gimp_dbus_service_ui_complete_batch_run() or e.g. g_dbus_method_invocation_return_error() on it) and no order signal handlers will run. If no signal handler handles the invocation, the %G_DBUS_ERROR_UNKNOWN_METHOD error is returned.
+   *
+   * Returns: %TRUE if the invocation was handled, %FALSE to let other signal handlers run.
+   */
+  g_signal_new ("handle-batch-run",
+    G_TYPE_FROM_INTERFACE (iface),
+    G_SIGNAL_RUN_LAST,
+    G_STRUCT_OFFSET (GimpDBusServiceUIIface, handle_batch_run),
+    g_signal_accumulator_true_handled,
+    NULL,
+    g_cclosure_marshal_generic,
+    G_TYPE_BOOLEAN,
+    3,
+    G_TYPE_DBUS_METHOD_INVOCATION, G_TYPE_STRING, G_TYPE_STRING);
+
+  /**
+   * GimpDBusServiceUI::handle-activate:
+   * @object: A #GimpDBusServiceUI.
+   * @invocation: A #GDBusMethodInvocation.
+   *
+   * Signal emitted when a remote caller is invoking the <link linkend="gdbus-method-org-gimp-GIMP-UI.Activate">Activate()</link> D-Bus method.
+   *
+   * If a signal handler returns %TRUE, it means the signal handler will handle the invocation (e.g. take a reference to @invocation and eventually call gimp_dbus_service_ui_complete_activate() or e.g. g_dbus_method_invocation_return_error() on it) and no order signal handlers will run. If no signal handler handles the invocation, the %G_DBUS_ERROR_UNKNOWN_METHOD error is returned.
+   *
+   * Returns: %TRUE if the invocation was handled, %FALSE to let other signal handlers run.
+   */
+  g_signal_new ("handle-activate",
+    G_TYPE_FROM_INTERFACE (iface),
+    G_SIGNAL_RUN_LAST,
+    G_STRUCT_OFFSET (GimpDBusServiceUIIface, handle_activate),
+    g_signal_accumulator_true_handled,
+    NULL,
+    g_cclosure_marshal_generic,
+    G_TYPE_BOOLEAN,
+    1,
+    G_TYPE_DBUS_METHOD_INVOCATION);
+
+  /* GObject signals for received D-Bus signals: */
+  /**
+   * GimpDBusServiceUI::opened:
+   * @object: A #GimpDBusServiceUI.
+   * @arg_uri: Argument.
+   *
+   * On the client-side, this signal is emitted whenever the D-Bus signal <link linkend="gdbus-signal-org-gimp-GIMP-UI.Opened">"Opened"</link> is received.
+   *
+   * On the service-side, this signal can be used with e.g. g_signal_emit_by_name() to make the object emit the D-Bus signal.
+   */
+  g_signal_new ("opened",
+    G_TYPE_FROM_INTERFACE (iface),
+    G_SIGNAL_RUN_LAST,
+    G_STRUCT_OFFSET (GimpDBusServiceUIIface, opened),
+    NULL,
+    NULL,
+    g_cclosure_marshal_generic,
+    G_TYPE_NONE,
+    1, G_TYPE_STRING);
+
+}
+
+/**
+ * gimp_dbus_service_ui_emit_opened:
+ * @object: A #GimpDBusServiceUI.
+ * @arg_uri: Argument to pass with the signal.
+ *
+ * Emits the <link linkend="gdbus-signal-org-gimp-GIMP-UI.Opened">"Opened"</link> D-Bus signal.
+ */
+void
+gimp_dbus_service_ui_emit_opened (
+    GimpDBusServiceUI *object,
+    const gchar *arg_uri)
+{
+  g_signal_emit_by_name (object, "opened", arg_uri);
+}
+
+/**
+ * gimp_dbus_service_ui_call_open:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_uri: Argument to pass with the method invocation.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.Open">Open()</link> D-Bus method on @proxy.
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_call_open_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_call_open_sync() for the synchronous, blocking version of this method.
+ */
+void
+gimp_dbus_service_ui_call_open (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  g_dbus_proxy_call (G_DBUS_PROXY (proxy),
+    "Open",
+    g_variant_new ("(s)",
+                   arg_uri),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    callback,
+    user_data);
+}
+
+/**
+ * gimp_dbus_service_ui_call_open_finish:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_call_open().
+ * @error: Return location for error or %NULL.
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_call_open().
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_open_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), res, error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_open_sync:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_uri: Argument to pass with the method invocation.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL.
+ *
+ * Synchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.Open">Open()</link> D-Bus method on @proxy. The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_call_open() for the asynchronous version of this method.
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_open_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+    "Open",
+    g_variant_new ("(s)",
+                   arg_uri),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_open_as_new:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_uri: Argument to pass with the method invocation.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.OpenAsNew">OpenAsNew()</link> D-Bus method on @proxy.
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_call_open_as_new_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_call_open_as_new_sync() for the synchronous, blocking version of this method.
+ */
+void
+gimp_dbus_service_ui_call_open_as_new (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  g_dbus_proxy_call (G_DBUS_PROXY (proxy),
+    "OpenAsNew",
+    g_variant_new ("(s)",
+                   arg_uri),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    callback,
+    user_data);
+}
+
+/**
+ * gimp_dbus_service_ui_call_open_as_new_finish:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_call_open_as_new().
+ * @error: Return location for error or %NULL.
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_call_open_as_new().
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_open_as_new_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), res, error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_open_as_new_sync:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_uri: Argument to pass with the method invocation.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL.
+ *
+ * Synchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.OpenAsNew">OpenAsNew()</link> D-Bus method on @proxy. The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_call_open_as_new() for the asynchronous version of this method.
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_open_as_new_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+    "OpenAsNew",
+    g_variant_new ("(s)",
+                   arg_uri),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_batch_run:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_interpreter: Argument to pass with the method invocation.
+ * @arg_command: Argument to pass with the method invocation.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.BatchRun">BatchRun()</link> D-Bus method on @proxy.
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_call_batch_run_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_call_batch_run_sync() for the synchronous, blocking version of this method.
+ */
+void
+gimp_dbus_service_ui_call_batch_run (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_interpreter,
+    const gchar *arg_command,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  g_dbus_proxy_call (G_DBUS_PROXY (proxy),
+    "BatchRun",
+    g_variant_new ("(ss)",
+                   arg_interpreter,
+                   arg_command),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    callback,
+    user_data);
+}
+
+/**
+ * gimp_dbus_service_ui_call_batch_run_finish:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_call_batch_run().
+ * @error: Return location for error or %NULL.
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_call_batch_run().
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_batch_run_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), res, error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_batch_run_sync:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @arg_interpreter: Argument to pass with the method invocation.
+ * @arg_command: Argument to pass with the method invocation.
+ * @out_success: (out) (optional): Return location for return parameter or %NULL to ignore.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL.
+ *
+ * Synchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.BatchRun">BatchRun()</link> D-Bus method on @proxy. The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_call_batch_run() for the asynchronous version of this method.
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_batch_run_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_interpreter,
+    const gchar *arg_command,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+    "BatchRun",
+    g_variant_new ("(ss)",
+                   arg_interpreter,
+                   arg_command),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "(b)",
+                 out_success);
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_activate:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.Activate">Activate()</link> D-Bus method on @proxy.
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_call_activate_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_call_activate_sync() for the synchronous, blocking version of this method.
+ */
+void
+gimp_dbus_service_ui_call_activate (
+    GimpDBusServiceUI *proxy,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  g_dbus_proxy_call (G_DBUS_PROXY (proxy),
+    "Activate",
+    g_variant_new ("()"),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    callback,
+    user_data);
+}
+
+/**
+ * gimp_dbus_service_ui_call_activate_finish:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_call_activate().
+ * @error: Return location for error or %NULL.
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_call_activate().
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_activate_finish (
+    GimpDBusServiceUI *proxy,
+    GAsyncResult *res,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), res, error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "()");
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_call_activate_sync:
+ * @proxy: A #GimpDBusServiceUIProxy.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL.
+ *
+ * Synchronously invokes the <link linkend="gdbus-method-org-gimp-GIMP-UI.Activate">Activate()</link> D-Bus method on @proxy. The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_call_activate() for the asynchronous version of this method.
+ *
+ * Returns: (skip): %TRUE if the call succeded, %FALSE if @error is set.
+ */
+gboolean
+gimp_dbus_service_ui_call_activate_sync (
+    GimpDBusServiceUI *proxy,
+    GCancellable *cancellable,
+    GError **error)
+{
+  GVariant *_ret;
+  _ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+    "Activate",
+    g_variant_new ("()"),
+    G_DBUS_CALL_FLAGS_NONE,
+    -1,
+    cancellable,
+    error);
+  if (_ret == NULL)
+    goto _out;
+  g_variant_get (_ret,
+                 "()");
+  g_variant_unref (_ret);
+_out:
+  return _ret != NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_complete_open:
+ * @object: A #GimpDBusServiceUI.
+ * @invocation: (transfer full): A #GDBusMethodInvocation.
+ * @success: Parameter to return.
+ *
+ * Helper function used in service implementations to finish handling invocations of the <link linkend="gdbus-method-org-gimp-GIMP-UI.Open">Open()</link> D-Bus method. If you instead want to finish handling an invocation by returning an error, use g_dbus_method_invocation_return_error() or similar.
+ *
+ * This method will free @invocation, you cannot use it afterwards.
+ */
+void
+gimp_dbus_service_ui_complete_open (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success)
+{
+  g_dbus_method_invocation_return_value (invocation,
+    g_variant_new ("(b)",
+                   success));
+}
+
+/**
+ * gimp_dbus_service_ui_complete_open_as_new:
+ * @object: A #GimpDBusServiceUI.
+ * @invocation: (transfer full): A #GDBusMethodInvocation.
+ * @success: Parameter to return.
+ *
+ * Helper function used in service implementations to finish handling invocations of the <link linkend="gdbus-method-org-gimp-GIMP-UI.OpenAsNew">OpenAsNew()</link> D-Bus method. If you instead want to finish handling an invocation by returning an error, use g_dbus_method_invocation_return_error() or similar.
+ *
+ * This method will free @invocation, you cannot use it afterwards.
+ */
+void
+gimp_dbus_service_ui_complete_open_as_new (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success)
+{
+  g_dbus_method_invocation_return_value (invocation,
+    g_variant_new ("(b)",
+                   success));
+}
+
+/**
+ * gimp_dbus_service_ui_complete_batch_run:
+ * @object: A #GimpDBusServiceUI.
+ * @invocation: (transfer full): A #GDBusMethodInvocation.
+ * @success: Parameter to return.
+ *
+ * Helper function used in service implementations to finish handling invocations of the <link linkend="gdbus-method-org-gimp-GIMP-UI.BatchRun">BatchRun()</link> D-Bus method. If you instead want to finish handling an invocation by returning an error, use g_dbus_method_invocation_return_error() or similar.
+ *
+ * This method will free @invocation, you cannot use it afterwards.
+ */
+void
+gimp_dbus_service_ui_complete_batch_run (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success)
+{
+  g_dbus_method_invocation_return_value (invocation,
+    g_variant_new ("(b)",
+                   success));
+}
+
+/**
+ * gimp_dbus_service_ui_complete_activate:
+ * @object: A #GimpDBusServiceUI.
+ * @invocation: (transfer full): A #GDBusMethodInvocation.
+ *
+ * Helper function used in service implementations to finish handling invocations of the <link linkend="gdbus-method-org-gimp-GIMP-UI.Activate">Activate()</link> D-Bus method. If you instead want to finish handling an invocation by returning an error, use g_dbus_method_invocation_return_error() or similar.
+ *
+ * This method will free @invocation, you cannot use it afterwards.
+ */
+void
+gimp_dbus_service_ui_complete_activate (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation)
+{
+  g_dbus_method_invocation_return_value (invocation,
+    g_variant_new ("()"));
+}
+
+/* ------------------------------------------------------------------------ */
+
+/**
+ * GimpDBusServiceUIProxy:
+ *
+ * The #GimpDBusServiceUIProxy structure contains only private data and should only be accessed using the provided API.
+ */
+
+/**
+ * GimpDBusServiceUIProxyClass:
+ * @parent_class: The parent class.
+ *
+ * Class structure for #GimpDBusServiceUIProxy.
+ */
+
+struct _GimpDBusServiceUIProxyPrivate
+{
+  GData *qdata;
+};
+
+static void gimp_dbus_service_ui_proxy_iface_init (GimpDBusServiceUIIface *iface);
+
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38
+G_DEFINE_TYPE_WITH_CODE (GimpDBusServiceUIProxy, gimp_dbus_service_ui_proxy, G_TYPE_DBUS_PROXY,
+                         G_ADD_PRIVATE (GimpDBusServiceUIProxy)
+                         G_IMPLEMENT_INTERFACE (GIMP_DBUS_SERVICE_TYPE_UI, gimp_dbus_service_ui_proxy_iface_init))
+
+#else
+G_DEFINE_TYPE_WITH_CODE (GimpDBusServiceUIProxy, gimp_dbus_service_ui_proxy, G_TYPE_DBUS_PROXY,
+                         G_IMPLEMENT_INTERFACE (GIMP_DBUS_SERVICE_TYPE_UI, gimp_dbus_service_ui_proxy_iface_init))
+
+#endif
+static void
+gimp_dbus_service_ui_proxy_finalize (GObject *object)
+{
+  GimpDBusServiceUIProxy *proxy = GIMP_DBUS_SERVICE_UI_PROXY (object);
+  g_datalist_clear (&proxy->priv->qdata);
+  G_OBJECT_CLASS (gimp_dbus_service_ui_proxy_parent_class)->finalize (object);
+}
+
+static void
+gimp_dbus_service_ui_proxy_get_property (GObject      *object,
+  guint         prop_id,
+  GValue       *value,
+  GParamSpec   *pspec G_GNUC_UNUSED)
+{
+}
+
+static void
+gimp_dbus_service_ui_proxy_set_property (GObject      *object,
+  guint         prop_id,
+  const GValue *value,
+  GParamSpec   *pspec G_GNUC_UNUSED)
+{
+}
+
+static void
+gimp_dbus_service_ui_proxy_g_signal (GDBusProxy *proxy,
+  const gchar *sender_name G_GNUC_UNUSED,
+  const gchar *signal_name,
+  GVariant *parameters)
+{
+  _ExtendedGDBusSignalInfo *info;
+  GVariantIter iter;
+  GVariant *child;
+  GValue *paramv;
+  gsize num_params;
+  gsize n;
+  guint signal_id;
+  info = (_ExtendedGDBusSignalInfo *) g_dbus_interface_info_lookup_signal ((GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct, signal_name);
+  if (info == NULL)
+    return;
+  num_params = g_variant_n_children (parameters);
+  paramv = g_new0 (GValue, num_params + 1);
+  g_value_init (&paramv[0], GIMP_DBUS_SERVICE_TYPE_UI);
+  g_value_set_object (&paramv[0], proxy);
+  g_variant_iter_init (&iter, parameters);
+  n = 1;
+  while ((child = g_variant_iter_next_value (&iter)) != NULL)
+    {
+      _ExtendedGDBusArgInfo *arg_info = (_ExtendedGDBusArgInfo *) info->parent_struct.args[n - 1];
+      if (arg_info->use_gvariant)
+        {
+          g_value_init (&paramv[n], G_TYPE_VARIANT);
+          g_value_set_variant (&paramv[n], child);
+          n++;
+        }
+      else
+        g_dbus_gvariant_to_gvalue (child, &paramv[n++]);
+      g_variant_unref (child);
+    }
+  signal_id = g_signal_lookup (info->signal_name, GIMP_DBUS_SERVICE_TYPE_UI);
+  g_signal_emitv (paramv, signal_id, 0, NULL);
+  for (n = 0; n < num_params + 1; n++)
+    g_value_unset (&paramv[n]);
+  g_free (paramv);
+}
+
+static void
+gimp_dbus_service_ui_proxy_g_properties_changed (GDBusProxy *_proxy,
+  GVariant *changed_properties,
+  const gchar *const *invalidated_properties)
+{
+  GimpDBusServiceUIProxy *proxy = GIMP_DBUS_SERVICE_UI_PROXY (_proxy);
+  guint n;
+  const gchar *key;
+  GVariantIter *iter;
+  _ExtendedGDBusPropertyInfo *info;
+  g_variant_get (changed_properties, "a{sv}", &iter);
+  while (g_variant_iter_next (iter, "{&sv}", &key, NULL))
+    {
+      info = (_ExtendedGDBusPropertyInfo *) g_dbus_interface_info_lookup_property ((GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct, key);
+      g_datalist_remove_data (&proxy->priv->qdata, key);
+      if (info != NULL)
+        g_object_notify (G_OBJECT (proxy), info->hyphen_name);
+    }
+  g_variant_iter_free (iter);
+  for (n = 0; invalidated_properties[n] != NULL; n++)
+    {
+      info = (_ExtendedGDBusPropertyInfo *) g_dbus_interface_info_lookup_property ((GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct, invalidated_properties[n]);
+      g_datalist_remove_data (&proxy->priv->qdata, invalidated_properties[n]);
+      if (info != NULL)
+        g_object_notify (G_OBJECT (proxy), info->hyphen_name);
+    }
+}
+
+static void
+gimp_dbus_service_ui_proxy_init (GimpDBusServiceUIProxy *proxy)
+{
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38
+  proxy->priv = gimp_dbus_service_ui_proxy_get_instance_private (proxy);
+#else
+  proxy->priv = G_TYPE_INSTANCE_GET_PRIVATE (proxy, GIMP_DBUS_SERVICE_TYPE_UI_PROXY, GimpDBusServiceUIProxyPrivate);
+#endif
+
+  g_dbus_proxy_set_interface_info (G_DBUS_PROXY (proxy), gimp_dbus_service_ui_interface_info ());
+}
+
+static void
+gimp_dbus_service_ui_proxy_class_init (GimpDBusServiceUIProxyClass *klass)
+{
+  GObjectClass *gobject_class;
+  GDBusProxyClass *proxy_class;
+
+  gobject_class = G_OBJECT_CLASS (klass);
+  gobject_class->finalize     = gimp_dbus_service_ui_proxy_finalize;
+  gobject_class->get_property = gimp_dbus_service_ui_proxy_get_property;
+  gobject_class->set_property = gimp_dbus_service_ui_proxy_set_property;
+
+  proxy_class = G_DBUS_PROXY_CLASS (klass);
+  proxy_class->g_signal = gimp_dbus_service_ui_proxy_g_signal;
+  proxy_class->g_properties_changed = gimp_dbus_service_ui_proxy_g_properties_changed;
+
+#if GLIB_VERSION_MAX_ALLOWED < GLIB_VERSION_2_38
+  g_type_class_add_private (klass, sizeof (GimpDBusServiceUIProxyPrivate));
+#endif
+}
+
+static void
+gimp_dbus_service_ui_proxy_iface_init (GimpDBusServiceUIIface *iface)
+{
+}
+
+/**
+ * gimp_dbus_service_ui_proxy_new:
+ * @connection: A #GDBusConnection.
+ * @flags: Flags from the #GDBusProxyFlags enumeration.
+ * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
+ * @object_path: An object path.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
+ * @user_data: User data to pass to @callback.
+ *
+ * Asynchronously creates a proxy for the D-Bus interface <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link>. See g_dbus_proxy_new() for more details.
+ *
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_proxy_new_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_proxy_new_sync() for the synchronous, blocking version of this constructor.
+ */
+void
+gimp_dbus_service_ui_proxy_new (
+    GDBusConnection     *connection,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GAsyncReadyCallback  callback,
+    gpointer             user_data)
+{
+  g_async_initable_new_async (GIMP_DBUS_SERVICE_TYPE_UI_PROXY, G_PRIORITY_DEFAULT, cancellable, callback, user_data, "g-flags", flags, "g-name", name, "g-connection", connection, "g-object-path", object_path, "g-interface-name", "org.gimp.GIMP.UI", NULL);
+}
+
+/**
+ * gimp_dbus_service_ui_proxy_new_finish:
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_proxy_new().
+ * @error: Return location for error or %NULL
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_proxy_new().
+ *
+ * Returns: (transfer full) (type GimpDBusServiceUIProxy): The constructed proxy object or %NULL if @error is set.
+ */
+GimpDBusServiceUI *
+gimp_dbus_service_ui_proxy_new_finish (
+    GAsyncResult        *res,
+    GError             **error)
+{
+  GObject *ret;
+  GObject *source_object;
+  source_object = g_async_result_get_source_object (res);
+  ret = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object), res, error);
+  g_object_unref (source_object);
+  if (ret != NULL)
+    return GIMP_DBUS_SERVICE_UI (ret);
+  else
+    return NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_proxy_new_sync:
+ * @connection: A #GDBusConnection.
+ * @flags: Flags from the #GDBusProxyFlags enumeration.
+ * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
+ * @object_path: An object path.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL
+ *
+ * Synchronously creates a proxy for the D-Bus interface <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link>. See g_dbus_proxy_new_sync() for more details.
+ *
+ * The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_proxy_new() for the asynchronous version of this constructor.
+ *
+ * Returns: (transfer full) (type GimpDBusServiceUIProxy): The constructed proxy object or %NULL if @error is set.
+ */
+GimpDBusServiceUI *
+gimp_dbus_service_ui_proxy_new_sync (
+    GDBusConnection     *connection,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GError             **error)
+{
+  GInitable *ret;
+  ret = g_initable_new (GIMP_DBUS_SERVICE_TYPE_UI_PROXY, cancellable, error, "g-flags", flags, "g-name", name, "g-connection", connection, "g-object-path", object_path, "g-interface-name", "org.gimp.GIMP.UI", NULL);
+  if (ret != NULL)
+    return GIMP_DBUS_SERVICE_UI (ret);
+  else
+    return NULL;
+}
+
+
+/**
+ * gimp_dbus_service_ui_proxy_new_for_bus:
+ * @bus_type: A #GBusType.
+ * @flags: Flags from the #GDBusProxyFlags enumeration.
+ * @name: A bus name (well-known or unique).
+ * @object_path: An object path.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
+ * @user_data: User data to pass to @callback.
+ *
+ * Like gimp_dbus_service_ui_proxy_new() but takes a #GBusType instead of a #GDBusConnection.
+ *
+ * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
+ * You can then call gimp_dbus_service_ui_proxy_new_for_bus_finish() to get the result of the operation.
+ *
+ * See gimp_dbus_service_ui_proxy_new_for_bus_sync() for the synchronous, blocking version of this constructor.
+ */
+void
+gimp_dbus_service_ui_proxy_new_for_bus (
+    GBusType             bus_type,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GAsyncReadyCallback  callback,
+    gpointer             user_data)
+{
+  g_async_initable_new_async (GIMP_DBUS_SERVICE_TYPE_UI_PROXY, G_PRIORITY_DEFAULT, cancellable, callback, user_data, "g-flags", flags, "g-name", name, "g-bus-type", bus_type, "g-object-path", object_path, "g-interface-name", "org.gimp.GIMP.UI", NULL);
+}
+
+/**
+ * gimp_dbus_service_ui_proxy_new_for_bus_finish:
+ * @res: The #GAsyncResult obtained from the #GAsyncReadyCallback passed to gimp_dbus_service_ui_proxy_new_for_bus().
+ * @error: Return location for error or %NULL
+ *
+ * Finishes an operation started with gimp_dbus_service_ui_proxy_new_for_bus().
+ *
+ * Returns: (transfer full) (type GimpDBusServiceUIProxy): The constructed proxy object or %NULL if @error is set.
+ */
+GimpDBusServiceUI *
+gimp_dbus_service_ui_proxy_new_for_bus_finish (
+    GAsyncResult        *res,
+    GError             **error)
+{
+  GObject *ret;
+  GObject *source_object;
+  source_object = g_async_result_get_source_object (res);
+  ret = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object), res, error);
+  g_object_unref (source_object);
+  if (ret != NULL)
+    return GIMP_DBUS_SERVICE_UI (ret);
+  else
+    return NULL;
+}
+
+/**
+ * gimp_dbus_service_ui_proxy_new_for_bus_sync:
+ * @bus_type: A #GBusType.
+ * @flags: Flags from the #GDBusProxyFlags enumeration.
+ * @name: A bus name (well-known or unique).
+ * @object_path: An object path.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: Return location for error or %NULL
+ *
+ * Like gimp_dbus_service_ui_proxy_new_sync() but takes a #GBusType instead of a #GDBusConnection.
+ *
+ * The calling thread is blocked until a reply is received.
+ *
+ * See gimp_dbus_service_ui_proxy_new_for_bus() for the asynchronous version of this constructor.
+ *
+ * Returns: (transfer full) (type GimpDBusServiceUIProxy): The constructed proxy object or %NULL if @error is set.
+ */
+GimpDBusServiceUI *
+gimp_dbus_service_ui_proxy_new_for_bus_sync (
+    GBusType             bus_type,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GError             **error)
+{
+  GInitable *ret;
+  ret = g_initable_new (GIMP_DBUS_SERVICE_TYPE_UI_PROXY, cancellable, error, "g-flags", flags, "g-name", name, "g-bus-type", bus_type, "g-object-path", object_path, "g-interface-name", "org.gimp.GIMP.UI", NULL);
+  if (ret != NULL)
+    return GIMP_DBUS_SERVICE_UI (ret);
+  else
+    return NULL;
+}
+
+
+/* ------------------------------------------------------------------------ */
+
+/**
+ * GimpDBusServiceUISkeleton:
+ *
+ * The #GimpDBusServiceUISkeleton structure contains only private data and should only be accessed using the provided API.
+ */
+
+/**
+ * GimpDBusServiceUISkeletonClass:
+ * @parent_class: The parent class.
+ *
+ * Class structure for #GimpDBusServiceUISkeleton.
+ */
+
+struct _GimpDBusServiceUISkeletonPrivate
+{
+  GValue *properties;
+  GList *changed_properties;
+  GSource *changed_properties_idle_source;
+  GMainContext *context;
+  GMutex lock;
+};
+
+static void
+_gimp_dbus_service_ui_skeleton_handle_method_call (
+  GDBusConnection *connection G_GNUC_UNUSED,
+  const gchar *sender G_GNUC_UNUSED,
+  const gchar *object_path G_GNUC_UNUSED,
+  const gchar *interface_name,
+  const gchar *method_name,
+  GVariant *parameters,
+  GDBusMethodInvocation *invocation,
+  gpointer user_data)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (user_data);
+  _ExtendedGDBusMethodInfo *info;
+  GVariantIter iter;
+  GVariant *child;
+  GValue *paramv;
+  gsize num_params;
+  guint num_extra;
+  gsize n;
+  guint signal_id;
+  GValue return_value = G_VALUE_INIT;
+  info = (_ExtendedGDBusMethodInfo *) g_dbus_method_invocation_get_method_info (invocation);
+  g_assert (info != NULL);
+  num_params = g_variant_n_children (parameters);
+  num_extra = info->pass_fdlist ? 3 : 2;  paramv = g_new0 (GValue, num_params + num_extra);
+  n = 0;
+  g_value_init (&paramv[n], GIMP_DBUS_SERVICE_TYPE_UI);
+  g_value_set_object (&paramv[n++], skeleton);
+  g_value_init (&paramv[n], G_TYPE_DBUS_METHOD_INVOCATION);
+  g_value_set_object (&paramv[n++], invocation);
+  if (info->pass_fdlist)
+    {
+#ifdef G_OS_UNIX
+      g_value_init (&paramv[n], G_TYPE_UNIX_FD_LIST);
+      g_value_set_object (&paramv[n++], g_dbus_message_get_unix_fd_list (g_dbus_method_invocation_get_message (invocation)));
+#else
+      g_assert_not_reached ();
+#endif
+    }
+  g_variant_iter_init (&iter, parameters);
+  while ((child = g_variant_iter_next_value (&iter)) != NULL)
+    {
+      _ExtendedGDBusArgInfo *arg_info = (_ExtendedGDBusArgInfo *) info->parent_struct.in_args[n - num_extra];
+      if (arg_info->use_gvariant)
+        {
+          g_value_init (&paramv[n], G_TYPE_VARIANT);
+          g_value_set_variant (&paramv[n], child);
+          n++;
+        }
+      else
+        g_dbus_gvariant_to_gvalue (child, &paramv[n++]);
+      g_variant_unref (child);
+    }
+  signal_id = g_signal_lookup (info->signal_name, GIMP_DBUS_SERVICE_TYPE_UI);
+  g_value_init (&return_value, G_TYPE_BOOLEAN);
+  g_signal_emitv (paramv, signal_id, 0, &return_value);
+  if (!g_value_get_boolean (&return_value))
+    g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_METHOD, "Method %s is not implemented on interface %s", method_name, interface_name);
+  g_value_unset (&return_value);
+  for (n = 0; n < num_params + num_extra; n++)
+    g_value_unset (&paramv[n]);
+  g_free (paramv);
+}
+
+static GVariant *
+_gimp_dbus_service_ui_skeleton_handle_get_property (
+  GDBusConnection *connection G_GNUC_UNUSED,
+  const gchar *sender G_GNUC_UNUSED,
+  const gchar *object_path G_GNUC_UNUSED,
+  const gchar *interface_name G_GNUC_UNUSED,
+  const gchar *property_name,
+  GError **error,
+  gpointer user_data)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (user_data);
+  GValue value = G_VALUE_INIT;
+  GParamSpec *pspec;
+  _ExtendedGDBusPropertyInfo *info;
+  GVariant *ret;
+  ret = NULL;
+  info = (_ExtendedGDBusPropertyInfo *) g_dbus_interface_info_lookup_property ((GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct, property_name);
+  g_assert (info != NULL);
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (skeleton), info->hyphen_name);
+  if (pspec == NULL)
+    {
+      g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS, "No property with name %s", property_name);
+    }
+  else
+    {
+      g_value_init (&value, pspec->value_type);
+      g_object_get_property (G_OBJECT (skeleton), info->hyphen_name, &value);
+      ret = g_dbus_gvalue_to_gvariant (&value, G_VARIANT_TYPE (info->parent_struct.signature));
+      g_value_unset (&value);
+    }
+  return ret;
+}
+
+static gboolean
+_gimp_dbus_service_ui_skeleton_handle_set_property (
+  GDBusConnection *connection G_GNUC_UNUSED,
+  const gchar *sender G_GNUC_UNUSED,
+  const gchar *object_path G_GNUC_UNUSED,
+  const gchar *interface_name G_GNUC_UNUSED,
+  const gchar *property_name,
+  GVariant *variant,
+  GError **error,
+  gpointer user_data)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (user_data);
+  GValue value = G_VALUE_INIT;
+  GParamSpec *pspec;
+  _ExtendedGDBusPropertyInfo *info;
+  gboolean ret;
+  ret = FALSE;
+  info = (_ExtendedGDBusPropertyInfo *) g_dbus_interface_info_lookup_property ((GDBusInterfaceInfo *) &_gimp_dbus_service_ui_interface_info.parent_struct, property_name);
+  g_assert (info != NULL);
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (skeleton), info->hyphen_name);
+  if (pspec == NULL)
+    {
+      g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS, "No property with name %s", property_name);
+    }
+  else
+    {
+      if (info->use_gvariant)
+        g_value_set_variant (&value, variant);
+      else
+        g_dbus_gvariant_to_gvalue (variant, &value);
+      g_object_set_property (G_OBJECT (skeleton), info->hyphen_name, &value);
+      g_value_unset (&value);
+      ret = TRUE;
+    }
+  return ret;
+}
+
+static const GDBusInterfaceVTable _gimp_dbus_service_ui_skeleton_vtable =
+{
+  _gimp_dbus_service_ui_skeleton_handle_method_call,
+  _gimp_dbus_service_ui_skeleton_handle_get_property,
+  _gimp_dbus_service_ui_skeleton_handle_set_property,
+  {NULL}
+};
+
+static GDBusInterfaceInfo *
+gimp_dbus_service_ui_skeleton_dbus_interface_get_info (GDBusInterfaceSkeleton *skeleton G_GNUC_UNUSED)
+{
+  return gimp_dbus_service_ui_interface_info ();
+}
+
+static GDBusInterfaceVTable *
+gimp_dbus_service_ui_skeleton_dbus_interface_get_vtable (GDBusInterfaceSkeleton *skeleton G_GNUC_UNUSED)
+{
+  return (GDBusInterfaceVTable *) &_gimp_dbus_service_ui_skeleton_vtable;
+}
+
+static GVariant *
+gimp_dbus_service_ui_skeleton_dbus_interface_get_properties (GDBusInterfaceSkeleton *_skeleton)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (_skeleton);
+
+  GVariantBuilder builder;
+  guint n;
+  g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));
+  if (_gimp_dbus_service_ui_interface_info.parent_struct.properties == NULL)
+    goto out;
+  for (n = 0; _gimp_dbus_service_ui_interface_info.parent_struct.properties[n] != NULL; n++)
+    {
+      GDBusPropertyInfo *info = _gimp_dbus_service_ui_interface_info.parent_struct.properties[n];
+      if (info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE)
+        {
+          GVariant *value;
+          value = _gimp_dbus_service_ui_skeleton_handle_get_property (g_dbus_interface_skeleton_get_connection (G_DBUS_INTERFACE_SKELETON (skeleton)), NULL, g_dbus_interface_skeleton_get_object_path (G_DBUS_INTERFACE_SKELETON (skeleton)), "org.gimp.GIMP.UI", info->name, NULL, skeleton);
+          if (value != NULL)
+            {
+              g_variant_take_ref (value);
+              g_variant_builder_add (&builder, "{sv}", info->name, value);
+              g_variant_unref (value);
+            }
+        }
+    }
+out:
+  return g_variant_builder_end (&builder);
+}
+
+static void
+gimp_dbus_service_ui_skeleton_dbus_interface_flush (GDBusInterfaceSkeleton *_skeleton)
+{
+}
+
+static void
+_gimp_dbus_service_ui_on_signal_opened (
+    GimpDBusServiceUI *object,
+    const gchar *arg_uri)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (object);
+
+  GList      *connections, *l;
+  GVariant   *signal_variant;
+  connections = g_dbus_interface_skeleton_get_connections (G_DBUS_INTERFACE_SKELETON (skeleton));
+
+  signal_variant = g_variant_ref_sink (g_variant_new ("(s)",
+                   arg_uri));
+  for (l = connections; l != NULL; l = l->next)
+    {
+      GDBusConnection *connection = l->data;
+      g_dbus_connection_emit_signal (connection,
+        NULL, g_dbus_interface_skeleton_get_object_path (G_DBUS_INTERFACE_SKELETON (skeleton)), "org.gimp.GIMP.UI", "Opened",
+        signal_variant, NULL);
+    }
+  g_variant_unref (signal_variant);
+  g_list_free_full (connections, g_object_unref);
+}
+
+static void gimp_dbus_service_ui_skeleton_iface_init (GimpDBusServiceUIIface *iface);
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38
+G_DEFINE_TYPE_WITH_CODE (GimpDBusServiceUISkeleton, gimp_dbus_service_ui_skeleton, G_TYPE_DBUS_INTERFACE_SKELETON,
+                         G_ADD_PRIVATE (GimpDBusServiceUISkeleton)
+                         G_IMPLEMENT_INTERFACE (GIMP_DBUS_SERVICE_TYPE_UI, gimp_dbus_service_ui_skeleton_iface_init))
+
+#else
+G_DEFINE_TYPE_WITH_CODE (GimpDBusServiceUISkeleton, gimp_dbus_service_ui_skeleton, G_TYPE_DBUS_INTERFACE_SKELETON,
+                         G_IMPLEMENT_INTERFACE (GIMP_DBUS_SERVICE_TYPE_UI, gimp_dbus_service_ui_skeleton_iface_init))
+
+#endif
+static void
+gimp_dbus_service_ui_skeleton_finalize (GObject *object)
+{
+  GimpDBusServiceUISkeleton *skeleton = GIMP_DBUS_SERVICE_UI_SKELETON (object);
+  g_list_free_full (skeleton->priv->changed_properties, (GDestroyNotify) _changed_property_free);
+  if (skeleton->priv->changed_properties_idle_source != NULL)
+    g_source_destroy (skeleton->priv->changed_properties_idle_source);
+  g_main_context_unref (skeleton->priv->context);
+  g_mutex_clear (&skeleton->priv->lock);
+  G_OBJECT_CLASS (gimp_dbus_service_ui_skeleton_parent_class)->finalize (object);
+}
+
+static void
+gimp_dbus_service_ui_skeleton_init (GimpDBusServiceUISkeleton *skeleton)
+{
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38
+  skeleton->priv = gimp_dbus_service_ui_skeleton_get_instance_private (skeleton);
+#else
+  skeleton->priv = G_TYPE_INSTANCE_GET_PRIVATE (skeleton, GIMP_DBUS_SERVICE_TYPE_UI_SKELETON, GimpDBusServiceUISkeletonPrivate);
+#endif
+
+  g_mutex_init (&skeleton->priv->lock);
+  skeleton->priv->context = g_main_context_ref_thread_default ();
+}
+
+static void
+gimp_dbus_service_ui_skeleton_class_init (GimpDBusServiceUISkeletonClass *klass)
+{
+  GObjectClass *gobject_class;
+  GDBusInterfaceSkeletonClass *skeleton_class;
+
+  gobject_class = G_OBJECT_CLASS (klass);
+  gobject_class->finalize = gimp_dbus_service_ui_skeleton_finalize;
+
+  skeleton_class = G_DBUS_INTERFACE_SKELETON_CLASS (klass);
+  skeleton_class->get_info = gimp_dbus_service_ui_skeleton_dbus_interface_get_info;
+  skeleton_class->get_properties = gimp_dbus_service_ui_skeleton_dbus_interface_get_properties;
+  skeleton_class->flush = gimp_dbus_service_ui_skeleton_dbus_interface_flush;
+  skeleton_class->get_vtable = gimp_dbus_service_ui_skeleton_dbus_interface_get_vtable;
+
+#if GLIB_VERSION_MAX_ALLOWED < GLIB_VERSION_2_38
+  g_type_class_add_private (klass, sizeof (GimpDBusServiceUISkeletonPrivate));
+#endif
+}
+
+static void
+gimp_dbus_service_ui_skeleton_iface_init (GimpDBusServiceUIIface *iface)
+{
+  iface->opened = _gimp_dbus_service_ui_on_signal_opened;
+}
+
+/**
+ * gimp_dbus_service_ui_skeleton_new:
+ *
+ * Creates a skeleton object for the D-Bus interface <link linkend="gdbus-interface-org-gimp-GIMP-UI.top_of_page">org.gimp.GIMP.UI</link>.
+ *
+ * Returns: (transfer full) (type GimpDBusServiceUISkeleton): The skeleton object.
+ */
+GimpDBusServiceUI *
+gimp_dbus_service_ui_skeleton_new (void)
+{
+  return GIMP_DBUS_SERVICE_UI (g_object_new (GIMP_DBUS_SERVICE_TYPE_UI_SKELETON, NULL));
+}
+
diff --git a/app/gui/gimpdbusservice-generated.h b/app/gui/gimpdbusservice-generated.h
new file mode 100644
index 0000000..5c8c465
--- /dev/null
+++ b/app/gui/gimpdbusservice-generated.h
@@ -0,0 +1,282 @@
+/*
+ * This file is generated by gdbus-codegen, do not modify it.
+ *
+ * The license of this code is the same as for the D-Bus interface description
+ * it was derived from. Note that it links to GLib, so must comply with the
+ * LGPL linking clauses.
+ */
+
+#ifndef __GIMPDBUSSERVICE_GENERATED_H__
+#define __GIMPDBUSSERVICE_GENERATED_H__
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+
+/* ------------------------------------------------------------------------ */
+/* Declarations for org.gimp.GIMP.UI */
+
+#define GIMP_DBUS_SERVICE_TYPE_UI (gimp_dbus_service_ui_get_type ())
+#define GIMP_DBUS_SERVICE_UI(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GIMP_DBUS_SERVICE_TYPE_UI, GimpDBusServiceUI))
+#define GIMP_DBUS_SERVICE_IS_UI(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GIMP_DBUS_SERVICE_TYPE_UI))
+#define GIMP_DBUS_SERVICE_UI_GET_IFACE(o) (G_TYPE_INSTANCE_GET_INTERFACE ((o), GIMP_DBUS_SERVICE_TYPE_UI, GimpDBusServiceUIIface))
+
+struct _GimpDBusServiceUI;
+typedef struct _GimpDBusServiceUI GimpDBusServiceUI;
+typedef struct _GimpDBusServiceUIIface GimpDBusServiceUIIface;
+
+struct _GimpDBusServiceUIIface
+{
+  GTypeInterface parent_iface;
+
+
+  gboolean (*handle_activate) (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation);
+
+  gboolean (*handle_batch_run) (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    const gchar *arg_interpreter,
+    const gchar *arg_command);
+
+  gboolean (*handle_open) (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    const gchar *arg_uri);
+
+  gboolean (*handle_open_as_new) (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    const gchar *arg_uri);
+
+  void (*opened) (
+    GimpDBusServiceUI *object,
+    const gchar *arg_uri);
+
+};
+
+GType gimp_dbus_service_ui_get_type (void) G_GNUC_CONST;
+
+GDBusInterfaceInfo *gimp_dbus_service_ui_interface_info (void);
+guint gimp_dbus_service_ui_override_properties (GObjectClass *klass, guint property_id_begin);
+
+
+/* D-Bus method call completion functions: */
+void gimp_dbus_service_ui_complete_open (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success);
+
+void gimp_dbus_service_ui_complete_open_as_new (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success);
+
+void gimp_dbus_service_ui_complete_batch_run (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation,
+    gboolean success);
+
+void gimp_dbus_service_ui_complete_activate (
+    GimpDBusServiceUI *object,
+    GDBusMethodInvocation *invocation);
+
+
+
+/* D-Bus signal emissions functions: */
+void gimp_dbus_service_ui_emit_opened (
+    GimpDBusServiceUI *object,
+    const gchar *arg_uri);
+
+
+
+/* D-Bus method calls: */
+void gimp_dbus_service_ui_call_open (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+gboolean gimp_dbus_service_ui_call_open_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error);
+
+gboolean gimp_dbus_service_ui_call_open_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error);
+
+void gimp_dbus_service_ui_call_open_as_new (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+gboolean gimp_dbus_service_ui_call_open_as_new_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error);
+
+gboolean gimp_dbus_service_ui_call_open_as_new_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_uri,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error);
+
+void gimp_dbus_service_ui_call_batch_run (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_interpreter,
+    const gchar *arg_command,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+gboolean gimp_dbus_service_ui_call_batch_run_finish (
+    GimpDBusServiceUI *proxy,
+    gboolean *out_success,
+    GAsyncResult *res,
+    GError **error);
+
+gboolean gimp_dbus_service_ui_call_batch_run_sync (
+    GimpDBusServiceUI *proxy,
+    const gchar *arg_interpreter,
+    const gchar *arg_command,
+    gboolean *out_success,
+    GCancellable *cancellable,
+    GError **error);
+
+void gimp_dbus_service_ui_call_activate (
+    GimpDBusServiceUI *proxy,
+    GCancellable *cancellable,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+gboolean gimp_dbus_service_ui_call_activate_finish (
+    GimpDBusServiceUI *proxy,
+    GAsyncResult *res,
+    GError **error);
+
+gboolean gimp_dbus_service_ui_call_activate_sync (
+    GimpDBusServiceUI *proxy,
+    GCancellable *cancellable,
+    GError **error);
+
+
+
+/* ---- */
+
+#define GIMP_DBUS_SERVICE_TYPE_UI_PROXY (gimp_dbus_service_ui_proxy_get_type ())
+#define GIMP_DBUS_SERVICE_UI_PROXY(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GIMP_DBUS_SERVICE_TYPE_UI_PROXY, GimpDBusServiceUIProxy))
+#define GIMP_DBUS_SERVICE_UI_PROXY_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GIMP_DBUS_SERVICE_TYPE_UI_PROXY, GimpDBusServiceUIProxyClass))
+#define GIMP_DBUS_SERVICE_UI_PROXY_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GIMP_DBUS_SERVICE_TYPE_UI_PROXY, GimpDBusServiceUIProxyClass))
+#define GIMP_DBUS_SERVICE_IS_UI_PROXY(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GIMP_DBUS_SERVICE_TYPE_UI_PROXY))
+#define GIMP_DBUS_SERVICE_IS_UI_PROXY_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GIMP_DBUS_SERVICE_TYPE_UI_PROXY))
+
+typedef struct _GimpDBusServiceUIProxy GimpDBusServiceUIProxy;
+typedef struct _GimpDBusServiceUIProxyClass GimpDBusServiceUIProxyClass;
+typedef struct _GimpDBusServiceUIProxyPrivate GimpDBusServiceUIProxyPrivate;
+
+struct _GimpDBusServiceUIProxy
+{
+  /*< private >*/
+  GDBusProxy parent_instance;
+  GimpDBusServiceUIProxyPrivate *priv;
+};
+
+struct _GimpDBusServiceUIProxyClass
+{
+  GDBusProxyClass parent_class;
+};
+
+GType gimp_dbus_service_ui_proxy_get_type (void) G_GNUC_CONST;
+
+#if GLIB_CHECK_VERSION(2, 44, 0)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (GimpDBusServiceUIProxy, g_object_unref)
+#endif
+
+void gimp_dbus_service_ui_proxy_new (
+    GDBusConnection     *connection,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GAsyncReadyCallback  callback,
+    gpointer             user_data);
+GimpDBusServiceUI *gimp_dbus_service_ui_proxy_new_finish (
+    GAsyncResult        *res,
+    GError             **error);
+GimpDBusServiceUI *gimp_dbus_service_ui_proxy_new_sync (
+    GDBusConnection     *connection,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GError             **error);
+
+void gimp_dbus_service_ui_proxy_new_for_bus (
+    GBusType             bus_type,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GAsyncReadyCallback  callback,
+    gpointer             user_data);
+GimpDBusServiceUI *gimp_dbus_service_ui_proxy_new_for_bus_finish (
+    GAsyncResult        *res,
+    GError             **error);
+GimpDBusServiceUI *gimp_dbus_service_ui_proxy_new_for_bus_sync (
+    GBusType             bus_type,
+    GDBusProxyFlags      flags,
+    const gchar         *name,
+    const gchar         *object_path,
+    GCancellable        *cancellable,
+    GError             **error);
+
+
+/* ---- */
+
+#define GIMP_DBUS_SERVICE_TYPE_UI_SKELETON (gimp_dbus_service_ui_skeleton_get_type ())
+#define GIMP_DBUS_SERVICE_UI_SKELETON(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GIMP_DBUS_SERVICE_TYPE_UI_SKELETON, GimpDBusServiceUISkeleton))
+#define GIMP_DBUS_SERVICE_UI_SKELETON_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GIMP_DBUS_SERVICE_TYPE_UI_SKELETON, GimpDBusServiceUISkeletonClass))
+#define GIMP_DBUS_SERVICE_UI_SKELETON_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GIMP_DBUS_SERVICE_TYPE_UI_SKELETON, GimpDBusServiceUISkeletonClass))
+#define GIMP_DBUS_SERVICE_IS_UI_SKELETON(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GIMP_DBUS_SERVICE_TYPE_UI_SKELETON))
+#define GIMP_DBUS_SERVICE_IS_UI_SKELETON_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GIMP_DBUS_SERVICE_TYPE_UI_SKELETON))
+
+typedef struct _GimpDBusServiceUISkeleton GimpDBusServiceUISkeleton;
+typedef struct _GimpDBusServiceUISkeletonClass GimpDBusServiceUISkeletonClass;
+typedef struct _GimpDBusServiceUISkeletonPrivate GimpDBusServiceUISkeletonPrivate;
+
+struct _GimpDBusServiceUISkeleton
+{
+  /*< private >*/
+  GDBusInterfaceSkeleton parent_instance;
+  GimpDBusServiceUISkeletonPrivate *priv;
+};
+
+struct _GimpDBusServiceUISkeletonClass
+{
+  GDBusInterfaceSkeletonClass parent_class;
+};
+
+GType gimp_dbus_service_ui_skeleton_get_type (void) G_GNUC_CONST;
+
+#if GLIB_CHECK_VERSION(2, 44, 0)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (GimpDBusServiceUISkeleton, g_object_unref)
+#endif
+
+GimpDBusServiceUI *gimp_dbus_service_ui_skeleton_new (void);
+
+
+G_END_DECLS
+
+#endif /* __GIMPDBUSSERVICE_GENERATED_H__ */
diff --git a/app/gui/gimpdbusservice.c b/app/gui/gimpdbusservice.c
new file mode 100644
index 0000000..1662861
--- /dev/null
+++ b/app/gui/gimpdbusservice.c
@@ -0,0 +1,408 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * GimpDBusService
+ * Copyright (C) 2007, 2008 Sven Neumann <sven@gimp.org>
+ * Copyright (C) 2013       Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "gui-types.h"
+
+#include "core/gimp.h"
+#include "core/gimp-batch.h"
+#include "core/gimpcontainer.h"
+
+#include "file/file-open.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplayshell.h"
+
+#include "gimpdbusservice.h"
+
+
+typedef struct
+{
+  GFile    *file;
+  gboolean  as_new;
+
+  gchar    *interpreter;
+  gchar    *command;
+} IdleData;
+
+static void       gimp_dbus_service_ui_iface_init  (GimpDBusServiceUIIface *iface);
+
+static void       gimp_dbus_service_dispose        (GObject               *object);
+static void       gimp_dbus_service_finalize       (GObject               *object);
+
+static gboolean   gimp_dbus_service_activate       (GimpDBusServiceUI     *service,
+                                                    GDBusMethodInvocation *invocation);
+static gboolean   gimp_dbus_service_open           (GimpDBusServiceUI     *service,
+                                                    GDBusMethodInvocation *invocation,
+                                                    const gchar           *uri);
+
+static gboolean   gimp_dbus_service_open_as_new    (GimpDBusServiceUI     *service,
+                                                    GDBusMethodInvocation *invocation,
+                                                    const gchar           *uri);
+
+static gboolean   gimp_dbus_service_batch_run      (GimpDBusServiceUI     *service,
+                                                    GDBusMethodInvocation *invocation,
+                                                    const gchar           *batch_interpreter,
+                                                    const gchar           *batch_command);
+
+static void       gimp_dbus_service_gimp_opened    (Gimp                  *gimp,
+                                                    GFile                 *file,
+                                                    GimpDBusService       *service);
+
+static gboolean   gimp_dbus_service_queue_open     (GimpDBusService       *service,
+                                                    const gchar           *uri,
+                                                    gboolean               as_new);
+static gboolean   gimp_dbus_service_queue_batch    (GimpDBusService       *service,
+                                                    const gchar           *interpreter,
+                                                    const gchar           *command);
+
+static gboolean   gimp_dbus_service_process_idle   (GimpDBusService       *service);
+static IdleData * gimp_dbus_service_open_data_new  (GimpDBusService       *service,
+                                                    const gchar           *uri,
+                                                    gboolean               as_new);
+static IdleData * gimp_dbus_service_batch_data_new (GimpDBusService       *service,
+                                                    const gchar           *interpreter,
+                                                    const gchar           *command);
+static void       gimp_dbus_service_idle_data_free (IdleData              *data);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpDBusService, gimp_dbus_service,
+                         GIMP_DBUS_SERVICE_TYPE_UI_SKELETON,
+                         G_IMPLEMENT_INTERFACE (GIMP_DBUS_SERVICE_TYPE_UI,
+                                                gimp_dbus_service_ui_iface_init))
+
+#define parent_class gimp_dbus_service_parent_class
+
+
+static void
+gimp_dbus_service_class_init (GimpDBusServiceClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose  = gimp_dbus_service_dispose;
+  object_class->finalize = gimp_dbus_service_finalize;
+}
+
+static void
+gimp_dbus_service_init (GimpDBusService *service)
+{
+  service->queue = g_queue_new ();
+}
+
+static void
+gimp_dbus_service_ui_iface_init (GimpDBusServiceUIIface *iface)
+{
+  iface->handle_activate    = gimp_dbus_service_activate;
+  iface->handle_open        = gimp_dbus_service_open;
+  iface->handle_open_as_new = gimp_dbus_service_open_as_new;
+  iface->handle_batch_run   = gimp_dbus_service_batch_run;
+}
+
+GObject *
+gimp_dbus_service_new (Gimp *gimp)
+{
+  GimpDBusService *service;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+
+  service = g_object_new (GIMP_TYPE_DBUS_SERVICE, NULL);
+
+  service->gimp = gimp;
+
+  g_signal_connect_object (gimp, "image-opened",
+                           G_CALLBACK (gimp_dbus_service_gimp_opened),
+                           service, 0);
+
+  return G_OBJECT (service);
+}
+
+static void
+gimp_dbus_service_dispose (GObject *object)
+{
+  GimpDBusService *service = GIMP_DBUS_SERVICE (object);
+
+  if (service->source)
+    {
+      g_source_remove (g_source_get_id (service->source));
+      service->source = NULL;
+    }
+
+  while (! g_queue_is_empty (service->queue))
+    {
+      gimp_dbus_service_idle_data_free (g_queue_pop_head (service->queue));
+    }
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_dbus_service_finalize (GObject *object)
+{
+  GimpDBusService *service = GIMP_DBUS_SERVICE (object);
+
+  if (service->queue)
+    {
+      g_queue_free (service->queue);
+      service->queue = NULL;
+    }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+gboolean
+gimp_dbus_service_activate (GimpDBusServiceUI     *service,
+                            GDBusMethodInvocation *invocation)
+{
+  Gimp *gimp = GIMP_DBUS_SERVICE (service)->gimp;
+
+  /*  We want to be called again later in case that GIMP is not fully
+   *  started yet.
+   */
+  if (gimp_is_restored (gimp))
+    {
+      GimpObject *display;
+
+      display = gimp_container_get_first_child (gimp->displays);
+
+      if (display)
+        gimp_display_shell_present (gimp_display_get_shell (GIMP_DISPLAY (display)));
+    }
+
+  gimp_dbus_service_ui_complete_activate (service, invocation);
+
+  return TRUE;
+}
+
+gboolean
+gimp_dbus_service_open (GimpDBusServiceUI     *service,
+                        GDBusMethodInvocation *invocation,
+                        const gchar           *uri)
+{
+  gboolean success;
+
+  success = gimp_dbus_service_queue_open (GIMP_DBUS_SERVICE (service),
+                                          uri, FALSE);
+
+  gimp_dbus_service_ui_complete_open (service, invocation, success);
+
+  return TRUE;
+}
+
+gboolean
+gimp_dbus_service_open_as_new (GimpDBusServiceUI     *service,
+                               GDBusMethodInvocation *invocation,
+                               const gchar           *uri)
+{
+  gboolean success;
+
+  success = gimp_dbus_service_queue_open (GIMP_DBUS_SERVICE (service),
+                                          uri, TRUE);
+
+  gimp_dbus_service_ui_complete_open_as_new (service, invocation, success);
+
+  return TRUE;
+}
+
+gboolean
+gimp_dbus_service_batch_run (GimpDBusServiceUI     *service,
+                             GDBusMethodInvocation *invocation,
+                             const gchar           *batch_interpreter,
+                             const gchar           *batch_command)
+{
+  gboolean success;
+
+  success = gimp_dbus_service_queue_batch (GIMP_DBUS_SERVICE (service),
+                                           batch_interpreter,
+                                           batch_command);
+
+  gimp_dbus_service_ui_complete_batch_run (service, invocation, success);
+
+  return TRUE;
+}
+
+static void
+gimp_dbus_service_gimp_opened (Gimp            *gimp,
+                               GFile           *file,
+                               GimpDBusService *service)
+{
+  gchar *uri = g_file_get_uri (file);
+
+  g_signal_emit_by_name (service, "opened", uri);
+
+  g_free (uri);
+}
+
+/*
+ * Adds a request to open a file to the end of the queue and
+ * starts an idle source if it is not already running.
+ */
+static gboolean
+gimp_dbus_service_queue_open (GimpDBusService *service,
+                              const gchar     *uri,
+                              gboolean         as_new)
+{
+  g_queue_push_tail (service->queue,
+                     gimp_dbus_service_open_data_new (service, uri, as_new));
+
+  if (! service->source)
+    {
+      service->source = g_idle_source_new ();
+
+      g_source_set_priority (service->source, G_PRIORITY_LOW);
+      g_source_set_callback (service->source,
+                             (GSourceFunc) gimp_dbus_service_process_idle,
+                             service,
+                             NULL);
+      g_source_attach (service->source, NULL);
+      g_source_unref (service->source);
+    }
+
+  /*  The call always succeeds as it is handled in one way or another.
+   *  Even presenting an error message is considered success ;-)
+   */
+  return TRUE;
+}
+
+/*
+ * Adds a request to run a batch command to the end of the queue and
+ * starts an idle source if it is not already running.
+ */
+static gboolean
+gimp_dbus_service_queue_batch (GimpDBusService *service,
+                               const gchar     *interpreter,
+                               const gchar     *command)
+{
+  g_queue_push_tail (service->queue,
+                     gimp_dbus_service_batch_data_new (service,
+                                                       interpreter,
+                                                       command));
+
+  if (! service->source)
+    {
+      service->source = g_idle_source_new ();
+
+      g_source_set_priority (service->source, G_PRIORITY_LOW);
+      g_source_set_callback (service->source,
+                             (GSourceFunc) gimp_dbus_service_process_idle,
+                             service,
+                             NULL);
+      g_source_attach (service->source, NULL);
+      g_source_unref (service->source);
+    }
+
+  /*  The call always succeeds as it is handled in one way or another.
+   *  Even presenting an error message is considered success ;-)
+   */
+  return TRUE;
+}
+
+/*
+ * Idle callback that removes the first request from the queue and
+ * handles it. If there are no more requests, the idle source is
+ * removed.
+ */
+static gboolean
+gimp_dbus_service_process_idle (GimpDBusService *service)
+{
+  IdleData *data;
+
+  if (! service->gimp->restored)
+    return TRUE;
+
+  data = g_queue_pop_tail (service->queue);
+
+  if (data)
+    {
+
+      if (data->file)
+        file_open_from_command_line (service->gimp, data->file, data->as_new,
+                                     NULL, /* FIXME monitor */
+                                     0 /* FIXME monitor */);
+      if (data->command)
+        {
+          const gchar *commands[2] = {data->command, 0};
+
+          gimp_batch_run (service->gimp, data->interpreter,
+                          commands);
+        }
+
+      gimp_dbus_service_idle_data_free (data);
+
+      return TRUE;
+    }
+
+  service->source = NULL;
+
+  return FALSE;
+}
+
+static IdleData *
+gimp_dbus_service_open_data_new (GimpDBusService *service,
+                                 const gchar     *uri,
+                                 gboolean         as_new)
+{
+  IdleData *data    = g_slice_new (IdleData);
+
+  data->file        = g_file_new_for_uri (uri);
+  data->as_new      = as_new;
+  data->interpreter = NULL;
+  data->command     = NULL;
+
+  return data;
+}
+
+static IdleData *
+gimp_dbus_service_batch_data_new (GimpDBusService *service,
+                                  const gchar     *interpreter,
+                                  const gchar     *command)
+{
+  IdleData *data = g_slice_new (IdleData);
+
+  data->file     = NULL;
+  data->as_new   = FALSE;
+
+  data->command  = g_strdup (command);
+
+  if (g_strcmp0 (interpreter, "") == 0)
+    data->interpreter = NULL;
+  else
+    data->interpreter = g_strdup (interpreter);
+
+  return data;
+}
+
+static void
+gimp_dbus_service_idle_data_free (IdleData *data)
+{
+  if (data->file)
+    g_object_unref (data->file);
+
+  if (data->command)
+    g_free (data->command);
+  if (data->interpreter)
+    g_free (data->interpreter);
+
+  g_slice_free (IdleData, data);
+}
diff --git a/app/gui/gimpdbusservice.h b/app/gui/gimpdbusservice.h
new file mode 100644
index 0000000..0b5f433
--- /dev/null
+++ b/app/gui/gimpdbusservice.h
@@ -0,0 +1,68 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * GimpDBusService
+ * Copyright (C) 2007, 2008 Sven Neumann <sven@gimp.org>
+ * Copyright (C) 2013       Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_DBUS_SERVICE_H__
+#define __GIMP_DBUS_SERVICE_H__
+
+
+#include "gimpdbusservice-generated.h"
+
+/* service name and path should really be org.gimp.GIMP and
+ * /org/gimp/GIMP and only the interface be called UI.
+ */
+#define GIMP_DBUS_SERVICE_NAME   "org.gimp.GIMP.UI"
+#define GIMP_DBUS_SERVICE_PATH   "/org/gimp/GIMP/UI"
+#define GIMP_DBUS_INTERFACE_NAME "org.gimp.GIMP.UI"
+#define GIMP_DBUS_INTERFACE_PATH "/org/gimp/GIMP/UI"
+
+
+#define GIMP_TYPE_DBUS_SERVICE            (gimp_dbus_service_get_type ())
+#define GIMP_DBUS_SERVICE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_DBUS_SERVICE, GimpDBusService))
+#define GIMP_DBUS_SERVICE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_DBUS_SERVICE, GimpDBusServiceClass))
+#define GIMP_IS_DBUS_SERVICE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_DBUS_SERVICE))
+#define GIMP_IS_DBUS_SERVICE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_DBUS_SERVICE))
+#define GIMP_DBUS_SERVICE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_DBUS_SERVICE, GimpDBusServiceClass))
+
+
+typedef struct _GimpDBusService      GimpDBusService;
+typedef struct _GimpDBusServiceClass GimpDBusServiceClass;
+
+struct _GimpDBusService
+{
+  GimpDBusServiceUISkeleton  parent_instance;
+
+  Gimp    *gimp;
+  GQueue  *queue;
+  GSource *source;
+};
+
+struct _GimpDBusServiceClass
+{
+  GimpDBusServiceUISkeletonClass  parent_class;
+};
+
+
+GType     gimp_dbus_service_get_type (void) G_GNUC_CONST;
+
+GObject * gimp_dbus_service_new      (Gimp *gimp);
+
+
+#endif /* __GIMP_DBUS_SERVICE_H__ */
diff --git a/app/gui/gimpuiconfigurer.c b/app/gui/gimpuiconfigurer.c
new file mode 100644
index 0000000..dd9aa5d
--- /dev/null
+++ b/app/gui/gimpuiconfigurer.c
@@ -0,0 +1,622 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpuiconfigurer.c
+ * Copyright (C) 2009 Martin Nordholts <martinn@src.gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gui-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpcontext.h"
+
+#include "widgets/gimpdialogfactory.h"
+#include "widgets/gimpdock.h"
+#include "widgets/gimpdockcolumns.h"
+#include "widgets/gimpdockcontainer.h"
+#include "widgets/gimpdockwindow.h"
+#include "widgets/gimptoolbox.h"
+#include "widgets/gimpwidgets-utils.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplayshell.h"
+#include "display/gimpdisplayshell-appearance.h"
+#include "display/gimpimagewindow.h"
+
+#include "gimpuiconfigurer.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_GIMP
+};
+
+
+struct _GimpUIConfigurerPrivate
+{
+  Gimp *gimp;
+};
+
+
+static void              gimp_ui_configurer_set_property                (GObject           *object,
+                                                                         guint              property_id,
+                                                                         const GValue      *value,
+                                                                         GParamSpec        *pspec);
+static void              gimp_ui_configurer_get_property                (GObject           *object,
+                                                                         guint              property_id,
+                                                                         GValue            *value,
+                                                                         GParamSpec        *pspec);
+static void              gimp_ui_configurer_move_docks_to_columns       (GimpUIConfigurer  *ui_configurer,
+                                                                         GimpImageWindow   *uber_image_window);
+static void              gimp_ui_configurer_move_shells                 (GimpUIConfigurer  *ui_configurer,
+                                                                         GimpImageWindow   *source_image_window,
+                                                                         GimpImageWindow   *target_image_window);
+static void              gimp_ui_configurer_separate_docks              (GimpUIConfigurer  *ui_configurer,
+                                                                         GimpImageWindow   *source_image_window);
+static void              gimp_ui_configurer_move_docks_to_window        (GimpUIConfigurer  *ui_configurer,
+                                                                         GimpDockColumns   *dock_columns,
+                                                                         GimpAlignmentType  screen_side);
+static void              gimp_ui_configurer_separate_shells             (GimpUIConfigurer  *ui_configurer,
+                                                                         GimpImageWindow   *source_image_window);
+static void              gimp_ui_configurer_configure_for_single_window (GimpUIConfigurer  *ui_configurer);
+static void              gimp_ui_configurer_configure_for_multi_window  (GimpUIConfigurer  *ui_configurer);
+static GimpImageWindow * gimp_ui_configurer_get_uber_window             (GimpUIConfigurer  *ui_configurer);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpUIConfigurer, gimp_ui_configurer,
+                            GIMP_TYPE_OBJECT)
+
+#define parent_class gimp_ui_configurer_parent_class
+
+
+static void
+gimp_ui_configurer_class_init (GimpUIConfigurerClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->set_property = gimp_ui_configurer_set_property;
+  object_class->get_property = gimp_ui_configurer_get_property;
+
+  g_object_class_install_property (object_class, PROP_GIMP,
+                                   g_param_spec_object ("gimp", NULL, NULL,
+                                                        GIMP_TYPE_GIMP,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_ui_configurer_init (GimpUIConfigurer *ui_configurer)
+{
+  ui_configurer->p = gimp_ui_configurer_get_instance_private (ui_configurer);
+}
+
+static void
+gimp_ui_configurer_set_property (GObject      *object,
+                                 guint         property_id,
+                                 const GValue *value,
+                                 GParamSpec   *pspec)
+{
+  GimpUIConfigurer *ui_configurer = GIMP_UI_CONFIGURER (object);
+
+  switch (property_id)
+    {
+    case PROP_GIMP:
+      ui_configurer->p->gimp = g_value_get_object (value); /* don't ref */
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_ui_configurer_get_property (GObject    *object,
+                                 guint       property_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
+{
+  GimpUIConfigurer *ui_configurer = GIMP_UI_CONFIGURER (object);
+
+  switch (property_id)
+    {
+    case PROP_GIMP:
+      g_value_set_object (value, ui_configurer->p->gimp);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+
+static void
+gimp_ui_configurer_get_window_center_pos (GtkWindow *window,
+                                          gint      *out_x,
+                                          gint      *out_y)
+{
+  gint x, y, w, h;
+  gtk_window_get_position (window, &x, &y);
+  gtk_window_get_size (window, &w, &h);
+
+  if (out_x)
+    *out_x = x + w / 2;
+  if (out_y)
+    *out_y = y + h / 2;
+}
+
+/**
+ * gimp_ui_configurer_get_relative_window_pos:
+ * @window_a:
+ * @window_b:
+ *
+ * Returns: At what side @window_b is relative to @window_a. Either
+ * GIMP_ALIGN_LEFT or GIMP_ALIGN_RIGHT.
+ **/
+static GimpAlignmentType
+gimp_ui_configurer_get_relative_window_pos (GtkWindow *window_a,
+                                            GtkWindow *window_b)
+{
+  gint a_x, b_x;
+
+  gimp_ui_configurer_get_window_center_pos (window_a, &a_x, NULL);
+  gimp_ui_configurer_get_window_center_pos (window_b, &b_x, NULL);
+
+  return b_x < a_x ? GIMP_ALIGN_LEFT : GIMP_ALIGN_RIGHT;
+}
+
+static void
+gimp_ui_configurer_move_docks_to_columns (GimpUIConfigurer *ui_configurer,
+                                          GimpImageWindow  *uber_image_window)
+{
+  GList *dialogs     = NULL;
+  GList *dialog_iter = NULL;
+
+  dialogs =
+    g_list_copy (gimp_dialog_factory_get_open_dialogs (gimp_dialog_factory_get_singleton ()));
+
+  for (dialog_iter = dialogs; dialog_iter; dialog_iter = dialog_iter->next)
+    {
+      GimpDockWindow    *dock_window;
+      GimpDockContainer *dock_container;
+      GimpDockColumns   *dock_columns;
+      GList             *docks;
+      GList             *dock_iter;
+
+      if (!GIMP_IS_DOCK_WINDOW (dialog_iter->data))
+        continue;
+
+      dock_window = GIMP_DOCK_WINDOW (dialog_iter->data);
+
+      /* If the dock window is on the left side of the image window,
+       * move the docks to the left side. If the dock window is on the
+       * right side, move the docks to the right side of the image
+       * window.
+       */
+      if (gimp_ui_configurer_get_relative_window_pos (GTK_WINDOW (uber_image_window),
+                                                      GTK_WINDOW (dock_window)) == GIMP_ALIGN_LEFT)
+        dock_columns = gimp_image_window_get_left_docks (uber_image_window);
+      else
+        dock_columns = gimp_image_window_get_right_docks (uber_image_window);
+
+      dock_container = GIMP_DOCK_CONTAINER (dock_window);
+      g_object_add_weak_pointer (G_OBJECT (dock_window),
+                                 (gpointer) &dock_window);
+
+      docks = gimp_dock_container_get_docks (dock_container);
+      for (dock_iter = docks; dock_iter; dock_iter = dock_iter->next)
+        {
+          GimpDock *dock = GIMP_DOCK (dock_iter->data);
+
+          /* Move the dock from the image window to the dock columns
+           * widget. Note that we need a ref while the dock is parentless
+           */
+          g_object_ref (dock);
+          gimp_dock_window_remove_dock (dock_window, dock);
+          gimp_dock_columns_add_dock (dock_columns, dock, -1);
+          g_object_unref (dock);
+        }
+      g_list_free (docks);
+
+      if (dock_window)
+        g_object_remove_weak_pointer (G_OBJECT (dock_window),
+                                      (gpointer) &dock_window);
+
+      /* Kill the window if removing the dock didn't destroy it
+       * already. This will be the case for the toolbox dock window
+       */
+      if (GTK_IS_WIDGET (dock_window))
+        {
+          guint docks_len;
+
+          docks     = gimp_dock_container_get_docks (dock_container);
+          docks_len = g_list_length (docks);
+
+          if (docks_len == 0)
+            {
+              gimp_dialog_factory_remove_dialog (gimp_dialog_factory_get_singleton (),
+                                                 GTK_WIDGET (dock_window));
+              gtk_widget_destroy (GTK_WIDGET (dock_window));
+            }
+
+          g_list_free (docks);
+        }
+    }
+
+  g_list_free (dialogs);
+}
+
+/**
+ * gimp_ui_configurer_move_shells:
+ * @ui_configurer:
+ * @source_image_window:
+ * @target_image_window:
+ *
+ * Move all display shells from one image window to the another.
+ **/
+static void
+gimp_ui_configurer_move_shells (GimpUIConfigurer  *ui_configurer,
+                                GimpImageWindow   *source_image_window,
+                                GimpImageWindow   *target_image_window)
+{
+  while (gimp_image_window_get_n_shells (source_image_window) > 0)
+    {
+      GimpDisplayShell *shell;
+
+      shell = gimp_image_window_get_shell (source_image_window, 0);
+
+      g_object_ref (shell);
+      gimp_image_window_remove_shell (source_image_window, shell);
+      gimp_image_window_add_shell (target_image_window, shell);
+      g_object_unref (shell);
+    }
+}
+
+/**
+ * gimp_ui_configurer_separate_docks:
+ * @ui_configurer:
+ * @image_window:
+ *
+ * Move out the docks from the image window.
+ **/
+static void
+gimp_ui_configurer_separate_docks (GimpUIConfigurer  *ui_configurer,
+                                   GimpImageWindow   *image_window)
+{
+  GimpDockColumns *left_docks  = NULL;
+  GimpDockColumns *right_docks = NULL;
+
+  left_docks  = gimp_image_window_get_left_docks (image_window);
+  right_docks = gimp_image_window_get_right_docks (image_window);
+
+  gimp_ui_configurer_move_docks_to_window (ui_configurer, left_docks, GIMP_ALIGN_LEFT);
+  gimp_ui_configurer_move_docks_to_window (ui_configurer, right_docks, GIMP_ALIGN_RIGHT);
+}
+
+/**
+ * gimp_ui_configurer_move_docks_to_window:
+ * @dock_columns:
+ * @screen_side: At what side of the screen the dock window should be put.
+ *
+ * Moves docks in @dock_columns into a new #GimpDockWindow and
+ * position it on the screen in a non-overlapping manner.
+ */
+static void
+gimp_ui_configurer_move_docks_to_window (GimpUIConfigurer  *ui_configurer,
+                                         GimpDockColumns   *dock_columns,
+                                         GimpAlignmentType  screen_side)
+{
+  GdkScreen     *screen;
+  gint           monitor;
+  GdkRectangle   monitor_rect;
+  GList         *docks;
+  GList         *iter;
+  gboolean       contains_toolbox = FALSE;
+  GtkWidget     *dock_window;
+  GtkAllocation  original_size;
+  gchar          geometry[32];
+
+  docks = g_list_copy (gimp_dock_columns_get_docks (dock_columns));
+  if (! docks)
+    return;
+
+  screen  = gtk_widget_get_screen (GTK_WIDGET (dock_columns));
+  monitor = gimp_widget_get_monitor (GTK_WIDGET (dock_columns));
+
+  gdk_screen_get_monitor_workarea (screen, monitor, &monitor_rect);
+
+  /* Remember the size so we can set the new dock window to the same
+   * size
+   */
+  gtk_widget_get_allocation (GTK_WIDGET (dock_columns), &original_size);
+
+  /* Do we need a toolbox window? */
+  for (iter = docks; iter; iter = g_list_next (iter))
+    {
+      GimpDock *dock = GIMP_DOCK (iter->data);
+
+      if (GIMP_IS_TOOLBOX (dock))
+        {
+          contains_toolbox = TRUE;
+          break;
+        }
+    }
+
+  /* Create a dock window to put the dock in. Checking for
+   * GIMP_IS_TOOLBOX() is kind of ugly but not a disaster. We need
+   * the dock window correctly configured if we create it for the
+   * toolbox
+   */
+  dock_window =
+    gimp_dialog_factory_dialog_new (gimp_dialog_factory_get_singleton (),
+                                    screen,
+                                    monitor,
+                                    NULL /*ui_manager*/,
+                                    (contains_toolbox ?
+                                     "gimp-toolbox-window" :
+                                     "gimp-dock-window"),
+                                    -1 /*view_size*/,
+                                    FALSE /*present*/);
+
+  for (iter = docks; iter; iter = g_list_next (iter))
+    {
+      GimpDock *dock = GIMP_DOCK (iter->data);
+
+      /* Move the dock to the window */
+      g_object_ref (dock);
+      gimp_dock_columns_remove_dock (dock_columns, dock);
+      gimp_dock_window_add_dock (GIMP_DOCK_WINDOW (dock_window), dock, -1);
+      g_object_unref (dock);
+    }
+
+  /* Position the window */
+  if (screen_side == GIMP_ALIGN_LEFT)
+    {
+      g_snprintf (geometry, sizeof (geometry), "%+d%+d",
+                  monitor_rect.x,
+                  monitor_rect.y);
+    }
+  else if (screen_side == GIMP_ALIGN_RIGHT)
+    {
+      g_snprintf (geometry, sizeof (geometry), "%+d%+d",
+                  monitor_rect.x + monitor_rect.width - original_size.width,
+                  monitor_rect.y);
+    }
+  else
+    {
+      gimp_assert_not_reached ();
+    }
+
+  gtk_window_parse_geometry (GTK_WINDOW (dock_window), geometry);
+
+  /* Try to keep the same size */
+  gtk_window_set_default_size (GTK_WINDOW (dock_window),
+                               original_size.width,
+                               original_size.height);
+
+  /* Don't forget to show the window */
+  gtk_widget_show (dock_window);
+
+  g_list_free (docks);
+}
+
+/**
+ * gimp_ui_configurer_separate_shells:
+ * @ui_configurer:
+ * @source_image_window:
+ *
+ * Create one image window per display shell and move it there.
+ **/
+static void
+gimp_ui_configurer_separate_shells (GimpUIConfigurer *ui_configurer,
+                                    GimpImageWindow  *source_image_window)
+{
+  GimpDisplayShell *active_shell  = gimp_image_window_get_active_shell (source_image_window);
+  GimpImageWindow  *active_window = NULL;
+
+  /* The last display shell remains in its window */
+  while (gimp_image_window_get_n_shells (source_image_window) > 1)
+    {
+      GimpImageWindow  *new_image_window;
+      GimpDisplayShell *shell;
+
+      /* Create a new image window */
+      new_image_window = gimp_image_window_new (ui_configurer->p->gimp,
+                                                NULL,
+                                                gimp_dialog_factory_get_singleton (),
+                                                gtk_widget_get_screen (GTK_WIDGET (source_image_window)),
+                                                gimp_widget_get_monitor (GTK_WIDGET (source_image_window)));
+      /* Move the shell there */
+      shell = gimp_image_window_get_shell (source_image_window, 1);
+
+      if (shell == active_shell)
+        active_window = new_image_window;
+
+      g_object_ref (shell);
+      gimp_image_window_remove_shell (source_image_window, shell);
+      gimp_image_window_add_shell (new_image_window, shell);
+      g_object_unref (shell);
+
+      /* FIXME: If we don't set a size request here the window will be
+       * too small. Get rid of this hack and fix it the proper way
+       */
+      gtk_widget_set_size_request (GTK_WIDGET (new_image_window), 640, 480);
+
+      /* Show after we have added the shell */
+      gtk_widget_show (GTK_WIDGET (new_image_window));
+    }
+
+  /* If none of the shells were active, I assume the first one is. */
+  if (active_window == NULL)
+    active_window = source_image_window;
+
+  /* The active tab must stay at the top of the windows stack. */
+  gtk_window_present (GTK_WINDOW (active_window));
+}
+
+/**
+ * gimp_ui_configurer_configure_for_single_window:
+ * @ui_configurer:
+ *
+ * Move docks and display shells into a single window.
+ **/
+static void
+gimp_ui_configurer_configure_for_single_window (GimpUIConfigurer *ui_configurer)
+{
+  Gimp             *gimp              = ui_configurer->p->gimp;
+  GList            *windows           = gimp_get_image_windows (gimp);
+  GList            *iter              = NULL;
+  GimpImageWindow  *uber_image_window = NULL;
+  GimpDisplay      *active_display    = gimp_context_get_display (gimp_get_user_context (gimp));
+  GimpDisplayShell *active_shell      = gimp_display_get_shell (active_display);
+
+  /* Get and setup the window to put everything in */
+  uber_image_window = gimp_ui_configurer_get_uber_window (ui_configurer);
+
+  /* Mve docks to the left and right side of the image window */
+  gimp_ui_configurer_move_docks_to_columns (ui_configurer,
+                                            uber_image_window);
+
+  /* Move image shells from other windows to the uber image window */
+  for (iter = windows; iter; iter = g_list_next (iter))
+    {
+      GimpImageWindow *image_window = GIMP_IMAGE_WINDOW (iter->data);
+
+      /* Don't move stuff to itself */
+      if (image_window == uber_image_window)
+        continue;
+
+      /* Put the displays in the rest of the image windows into
+       * the uber image window
+       */
+      gimp_ui_configurer_move_shells (ui_configurer,
+                                      image_window,
+                                      uber_image_window);
+      /* Destroy the window */
+      gimp_image_window_destroy (image_window);
+    }
+
+  /* Ensure the context shell remains active after mode switch. */
+  gimp_image_window_set_active_shell (uber_image_window, active_shell);
+
+  g_list_free (windows);
+}
+
+/**
+ * gimp_ui_configurer_configure_for_multi_window:
+ * @ui_configurer:
+ *
+ * Moves all display shells into their own image window.
+ **/
+static void
+gimp_ui_configurer_configure_for_multi_window (GimpUIConfigurer *ui_configurer)
+{
+  Gimp  *gimp    = ui_configurer->p->gimp;
+  GList *windows = gimp_get_image_windows (gimp);
+  GList *iter    = NULL;
+
+  for (iter = windows; iter; iter = g_list_next (iter))
+    {
+      GimpImageWindow *image_window = GIMP_IMAGE_WINDOW (iter->data);
+
+      gimp_ui_configurer_separate_docks (ui_configurer, image_window);
+
+      gimp_ui_configurer_separate_shells (ui_configurer, image_window);
+    }
+
+  g_list_free (windows);
+}
+
+/**
+ * gimp_ui_configurer_get_uber_window:
+ * @ui_configurer:
+ *
+ * Returns: The window to be used as the main window for single-window
+ *          mode.
+ **/
+static GimpImageWindow *
+gimp_ui_configurer_get_uber_window (GimpUIConfigurer *ui_configurer)
+{
+  Gimp             *gimp         = ui_configurer->p->gimp;
+  GimpDisplay      *display      = gimp_get_display_iter (gimp)->data;
+  GimpDisplayShell *shell        = gimp_display_get_shell (display);
+  GimpImageWindow  *image_window = gimp_display_shell_get_window (shell);
+
+  return image_window;
+}
+
+/**
+ * gimp_ui_configurer_update_appearance:
+ * @ui_configurer:
+ *
+ * Updates the appearance of all shells in all image windows, so they
+ * do whatever they deem necessary to fit the new UI mode mode.
+ **/
+static void
+gimp_ui_configurer_update_appearance (GimpUIConfigurer *ui_configurer)
+{
+  Gimp  *gimp    = ui_configurer->p->gimp;
+  GList *windows = gimp_get_image_windows (gimp);
+  GList *list;
+
+  for (list = windows; list; list = g_list_next (list))
+    {
+      GimpImageWindow *image_window = GIMP_IMAGE_WINDOW (list->data);
+      gint             n_shells;
+      gint             i;
+
+      n_shells = gimp_image_window_get_n_shells (image_window);
+
+      for (i = 0; i < n_shells; i++)
+        {
+          GimpDisplayShell *shell;
+
+          shell = gimp_image_window_get_shell (image_window, i);
+
+          gimp_display_shell_appearance_update (shell);
+        }
+    }
+
+  g_list_free (windows);
+}
+
+/**
+ * gimp_ui_configurer_configure:
+ * @ui_configurer:
+ * @single_window_mode:
+ *
+ * Configure the UI.
+ **/
+void
+gimp_ui_configurer_configure (GimpUIConfigurer *ui_configurer,
+                              gboolean          single_window_mode)
+{
+  if (single_window_mode)
+    gimp_ui_configurer_configure_for_single_window (ui_configurer);
+  else
+    gimp_ui_configurer_configure_for_multi_window (ui_configurer);
+
+  gimp_ui_configurer_update_appearance (ui_configurer);
+}
diff --git a/app/gui/gimpuiconfigurer.h b/app/gui/gimpuiconfigurer.h
new file mode 100644
index 0000000..db22ffc
--- /dev/null
+++ b/app/gui/gimpuiconfigurer.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpuiconfigurer.h
+ * Copyright (C) 2009 Martin Nordholts <martinn@src.gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_UI_CONFIGURER_H__
+#define __GIMP_UI_CONFIGURER_H__
+
+
+#include "core/gimpobject.h"
+
+
+#define GIMP_TYPE_UI_CONFIGURER              (gimp_ui_configurer_get_type ())
+#define GIMP_UI_CONFIGURER(obj)              (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_UI_CONFIGURER, GimpUIConfigurer))
+#define GIMP_UI_CONFIGURER_CLASS(vtable)     (G_TYPE_CHECK_CLASS_CAST ((vtable), GIMP_TYPE_UI_CONFIGURER, GimpUIConfigurerClass))
+#define GIMP_IS_UI_CONFIGURER(obj)           (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_UI_CONFIGURER))
+#define GIMP_IS_UI_CONFIGURER_CLASS(vtable)  (G_TYPE_CHECK_CLASS_TYPE ((vtable), GIMP_TYPE_UI_CONFIGURER))
+#define GIMP_UI_CONFIGURER_GET_CLASS(inst)   (G_TYPE_INSTANCE_GET_CLASS ((inst), GIMP_TYPE_UI_CONFIGURER, GimpUIConfigurerClass))
+
+
+typedef struct _GimpUIConfigurerClass   GimpUIConfigurerClass;
+typedef struct _GimpUIConfigurerPrivate GimpUIConfigurerPrivate;
+
+struct _GimpUIConfigurer
+{
+  GimpObject parent_instance;
+
+  GimpUIConfigurerPrivate *p;
+};
+
+struct _GimpUIConfigurerClass
+{
+  GimpObjectClass parent_class;
+};
+
+
+GType         gimp_ui_configurer_get_type  (void) G_GNUC_CONST;
+void          gimp_ui_configurer_configure (GimpUIConfigurer *ui_configurer,
+                                            gboolean          single_window_mode);
+
+
+#endif  /* __GIMP_UI_CONFIGURER_H__ */
diff --git a/app/gui/gui-message.c b/app/gui/gui-message.c
new file mode 100644
index 0000000..90e6314
--- /dev/null
+++ b/app/gui/gui-message.c
@@ -0,0 +1,501 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gui-types.h"
+
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimpprogress.h"
+
+#include "plug-in/gimpplugin.h"
+
+#include "widgets/gimpcriticaldialog.h"
+#include "widgets/gimpdialogfactory.h"
+#include "widgets/gimpdockable.h"
+#include "widgets/gimperrorconsole.h"
+#include "widgets/gimperrordialog.h"
+#include "widgets/gimpprogressdialog.h"
+#include "widgets/gimpsessioninfo.h"
+#include "widgets/gimpwidgets-utils.h"
+#include "widgets/gimpwindowstrategy.h"
+
+#include "about.h"
+
+#include "gui-message.h"
+
+#include "gimp-intl.h"
+
+
+#define MAX_TRACES 3
+#define MAX_ERRORS 10
+
+
+typedef struct
+{
+  Gimp                *gimp;
+  gchar               *domain;
+  gchar               *message;
+  gchar               *trace;
+  GObject             *handler;
+  GimpMessageSeverity  severity;
+} GimpLogMessageData;
+
+
+static gboolean  gui_message_idle           (gpointer             user_data);
+static gboolean  gui_message_error_console  (Gimp                *gimp,
+                                             GimpMessageSeverity  severity,
+                                             const gchar         *domain,
+                                             const gchar         *message);
+static gboolean  gui_message_error_dialog   (Gimp                *gimp,
+                                             GObject             *handler,
+                                             GimpMessageSeverity  severity,
+                                             const gchar         *domain,
+                                             const gchar         *message,
+                                             const gchar         *trace);
+static void      gui_message_console        (GimpMessageSeverity  severity,
+                                             const gchar         *domain,
+                                             const gchar         *message);
+static gchar *   gui_message_format         (GimpMessageSeverity  severity,
+                                             const gchar         *domain,
+                                             const gchar         *message);
+
+static GtkWidget * global_error_dialog      (void);
+static GtkWidget * global_critical_dialog   (void);
+
+static void        gui_message_reset_errors (GObject             *object,
+                                             gpointer             user_data);
+
+
+static GMutex mutex;
+static gint   n_traces = 0;
+static gint   n_errors = 0;
+
+
+void
+gui_message (Gimp                *gimp,
+             GObject             *handler,
+             GimpMessageSeverity  severity,
+             const gchar         *domain,
+             const gchar         *message)
+{
+  gchar    *trace     = NULL;
+  gboolean  gen_trace = FALSE;
+
+  switch (gimp->message_handler)
+    {
+    case GIMP_ERROR_CONSOLE:
+      if (gui_message_error_console (gimp, severity, domain, message))
+        return;
+
+      gimp->message_handler = GIMP_MESSAGE_BOX;
+      /*  fallthru  */
+
+    case GIMP_MESSAGE_BOX:
+      if (severity >= GIMP_MESSAGE_BUG_WARNING)
+        {
+          g_mutex_lock (&mutex);
+          /* Trace creation can be time consuming so don't block the
+           * mutex for too long and only increment and set a boolean
+           * here.
+           */
+          if (n_traces < MAX_TRACES)
+            {
+              gen_trace = TRUE;
+              n_traces++;
+            }
+          g_mutex_unlock (&mutex);
+        }
+
+      if (gen_trace)
+        {
+          /* We need to create the trace here because for multi-thread
+           * errors (i.e. non-GIMP ones), the backtrace after a idle
+           * function will simply be useless. It needs to happen in the
+           * buggy thread to be meaningful.
+           */
+          gimp_stack_trace_print (NULL, NULL, &trace);
+        }
+
+      if (g_strcmp0 (GIMP_ACRONYM, domain) != 0)
+        {
+          /* Handle non-GIMP messages in a multi-thread safe way,
+           * because we can't know for sure whether the log message may
+           * not have been called from a thread other than the main one.
+           */
+          GimpLogMessageData *data;
+
+          data = g_new0 (GimpLogMessageData, 1);
+          data->gimp     = gimp;
+          data->domain   = g_strdup (domain);
+          data->message  = g_strdup (message);
+          data->trace    = trace;
+          data->handler  = handler? g_object_ref (handler) : NULL;
+          data->severity = severity;
+
+          gdk_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
+                                     gui_message_idle,
+                                     data, g_free);
+          return;
+        }
+      if (gui_message_error_dialog (gimp, handler, severity,
+                                    domain, message, trace))
+        break;
+
+      gimp->message_handler = GIMP_CONSOLE;
+      /*  fallthru  */
+
+    case GIMP_CONSOLE:
+      gui_message_console (severity, domain, message);
+      break;
+    }
+  if (trace)
+    g_free (trace);
+}
+
+static gboolean
+gui_message_idle (gpointer user_data)
+{
+  GimpLogMessageData *data = (GimpLogMessageData *) user_data;
+
+  if (! gui_message_error_dialog (data->gimp,
+                                  data->handler,
+                                  data->severity,
+                                  data->domain,
+                                  data->message,
+                                  data->trace))
+    {
+      gui_message_console (data->severity,
+                           data->domain,
+                           data->message);
+    }
+  g_free (data->domain);
+  g_free (data->message);
+  if (data->trace)
+    g_free (data->trace);
+  if (data->handler)
+    g_object_unref (data->handler);
+
+  return FALSE;
+}
+
+static gboolean
+gui_message_error_console (Gimp                *gimp,
+                           GimpMessageSeverity  severity,
+                           const gchar         *domain,
+                           const gchar         *message)
+{
+  GtkWidget *dockable;
+
+  dockable = gimp_dialog_factory_find_widget (gimp_dialog_factory_get_singleton (),
+                                              "gimp-error-console");
+
+  /* avoid raising the error console for unhighlighted messages */
+  if (dockable)
+    {
+      GtkWidget *child = gtk_bin_get_child (GTK_BIN (dockable));
+
+      if (GIMP_ERROR_CONSOLE (child)->highlight[severity])
+        dockable = NULL;
+    }
+
+  if (! dockable)
+    {
+      GdkScreen *screen;
+      gint       monitor;
+
+      monitor = gimp_get_monitor_at_pointer (&screen);
+
+      dockable =
+        gimp_window_strategy_show_dockable_dialog (GIMP_WINDOW_STRATEGY (gimp_get_window_strategy (gimp)),
+                                                   gimp,
+                                                   gimp_dialog_factory_get_singleton (),
+                                                   screen, monitor,
+                                                   "gimp-error-console");
+    }
+
+  if (dockable)
+    {
+      GtkWidget *child = gtk_bin_get_child (GTK_BIN (dockable));
+
+      gimp_error_console_add (GIMP_ERROR_CONSOLE (child),
+                              severity, domain, message);
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+progress_error_dialog_unset (GimpProgress *progress)
+{
+  g_object_set_data (G_OBJECT (progress), "gimp-error-dialog", NULL);
+}
+
+static GtkWidget *
+progress_error_dialog (GimpProgress *progress)
+{
+  GtkWidget *dialog;
+
+  g_return_val_if_fail (GIMP_IS_PROGRESS (progress), NULL);
+
+  dialog = g_object_get_data (G_OBJECT (progress), "gimp-error-dialog");
+
+  if (! dialog)
+    {
+      dialog = gimp_error_dialog_new (_("GIMP Message"));
+
+      g_object_set_data (G_OBJECT (progress), "gimp-error-dialog", dialog);
+
+      g_signal_connect_object (dialog, "destroy",
+                               G_CALLBACK (progress_error_dialog_unset),
+                               progress, G_CONNECT_SWAPPED);
+
+      if (GTK_IS_WIDGET (progress))
+        {
+          GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (progress));
+
+          if (GTK_IS_WINDOW (toplevel))
+            gtk_window_set_transient_for (GTK_WINDOW (dialog),
+                                          GTK_WINDOW (toplevel));
+        }
+      else
+        {
+          guint32 window_id = gimp_progress_get_window_id (progress);
+
+          if (window_id)
+            gimp_window_set_transient_for (GTK_WINDOW (dialog), window_id);
+        }
+    }
+
+  return dialog;
+}
+
+static gboolean
+gui_message_error_dialog (Gimp                *gimp,
+                          GObject             *handler,
+                          GimpMessageSeverity  severity,
+                          const gchar         *domain,
+                          const gchar         *message,
+                          const gchar         *trace)
+{
+  GtkWidget      *dialog;
+  GtkMessageType  type   = GTK_MESSAGE_ERROR;
+
+  switch (severity)
+    {
+    case GIMP_MESSAGE_INFO:
+      type = GTK_MESSAGE_INFO;
+      break;
+    case GIMP_MESSAGE_WARNING:
+      type = GTK_MESSAGE_WARNING;
+      break;
+    case GIMP_MESSAGE_ERROR:
+      type = GTK_MESSAGE_ERROR;
+      break;
+    case GIMP_MESSAGE_BUG_WARNING:
+    case GIMP_MESSAGE_BUG_CRITICAL:
+      type = GTK_MESSAGE_OTHER;
+      break;
+    }
+
+  if (severity >= GIMP_MESSAGE_BUG_WARNING)
+    {
+      /* Process differently programming errors.
+       * The reason is that we will generate traces, which will take
+       * significant place, and cannot be processed as a progress
+       * message or in the global dialog. It will require its own
+       * dedicated dialog which will encourage people to report the bug.
+       */
+      gboolean gui_error = FALSE;
+
+      g_mutex_lock (&mutex);
+      if (n_errors < MAX_ERRORS)
+        {
+          gui_error = TRUE;
+          n_errors++;
+        }
+      g_mutex_unlock (&mutex);
+
+      if (gui_error || trace)
+        {
+          gchar *text;
+
+          dialog = global_critical_dialog ();
+
+          text = gui_message_format (severity, domain, message);
+          gimp_critical_dialog_add (dialog, text, trace, FALSE, NULL, 0);
+
+          gtk_widget_show (dialog);
+
+          g_free (text);
+
+          return TRUE;
+        }
+      else
+        {
+          const gchar *reason = "Message";
+
+          gimp_enum_get_value (GIMP_TYPE_MESSAGE_SEVERITY, severity,
+                               NULL, NULL, &reason, NULL);
+
+          /* Since we overridden glib default's WARNING and CRITICAL
+           * handler, if we decide not to handle this error in the end,
+           * let's just print it in terminal in a similar fashion as
+           * glib's default handler (though without the fancy terminal
+           * colors right now).
+           */
+          g_printerr ("%s-%s: %s\n", domain, reason, message);
+
+          return TRUE;
+        }
+    }
+  else if (GIMP_IS_PROGRESS (handler))
+    {
+      /* If there's already an error dialog associated with this
+       * progress, then continue without trying gimp_progress_message().
+       */
+      if (! g_object_get_data (handler, "gimp-error-dialog") &&
+          gimp_progress_message (GIMP_PROGRESS (handler), gimp,
+                                 severity, domain, message))
+        {
+          return TRUE;
+        }
+    }
+  else if (GTK_IS_WIDGET (handler))
+    {
+      GtkWidget *parent = GTK_WIDGET (handler);
+
+      dialog =
+        gtk_message_dialog_new (GTK_WINDOW (gtk_widget_get_toplevel (parent)),
+                                GTK_DIALOG_DESTROY_WITH_PARENT,
+                                type, GTK_BUTTONS_OK,
+                                "%s", message);
+
+      g_signal_connect (dialog, "response",
+                        G_CALLBACK (gtk_widget_destroy),
+                        NULL);
+
+      gtk_widget_show (dialog);
+
+      return TRUE;
+    }
+
+  if (GIMP_IS_PROGRESS (handler) && ! GIMP_IS_PROGRESS_DIALOG (handler))
+    dialog = progress_error_dialog (GIMP_PROGRESS (handler));
+  else
+    dialog = global_error_dialog ();
+
+  if (dialog)
+    {
+      gimp_error_dialog_add (GIMP_ERROR_DIALOG (dialog),
+                             gimp_get_message_icon_name (severity),
+                             domain, message);
+      gtk_window_present (GTK_WINDOW (dialog));
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+gui_message_console (GimpMessageSeverity  severity,
+                     const gchar         *domain,
+                     const gchar         *message)
+{
+  gchar *formatted_message;
+
+  formatted_message = gui_message_format (severity, domain, message);
+  g_printerr ("%s\n\n", formatted_message);
+  g_free (formatted_message);
+}
+
+static gchar *
+gui_message_format (GimpMessageSeverity  severity,
+                    const gchar         *domain,
+                    const gchar         *message)
+{
+  const gchar *desc = "Message";
+  gchar       *formatted_message;
+
+  gimp_enum_get_value (GIMP_TYPE_MESSAGE_SEVERITY, severity,
+                       NULL, NULL, &desc, NULL);
+
+  formatted_message = g_strdup_printf ("%s-%s: %s", domain, desc, message);
+
+  return formatted_message;
+}
+
+static GtkWidget *
+global_error_dialog (void)
+{
+  GdkScreen *screen;
+  gint       monitor;
+
+  monitor = gimp_get_monitor_at_pointer (&screen);
+
+  return gimp_dialog_factory_dialog_new (gimp_dialog_factory_get_singleton (),
+                                         screen, monitor,
+                                         NULL /*ui_manager*/,
+                                         "gimp-error-dialog", -1,
+                                         FALSE);
+}
+
+static GtkWidget *
+global_critical_dialog (void)
+{
+  GtkWidget *dialog;
+  GdkScreen *screen;
+  gint       monitor;
+
+  monitor = gimp_get_monitor_at_pointer (&screen);
+
+  dialog = gimp_dialog_factory_dialog_new (gimp_dialog_factory_get_singleton (),
+                                           screen, monitor,
+                                           NULL /*ui_manager*/,
+                                           "gimp-critical-dialog", -1,
+                                           FALSE);
+  g_signal_handlers_disconnect_by_func (dialog,
+                                        gui_message_reset_errors,
+                                        NULL);
+  g_signal_connect (dialog, "destroy",
+                    G_CALLBACK (gui_message_reset_errors),
+                    NULL);
+  return dialog;
+}
+
+static void
+gui_message_reset_errors (GObject  *object,
+                          gpointer  user_data)
+{
+  g_mutex_lock (&mutex);
+  n_errors = 0;
+  n_traces = 0;
+  g_mutex_unlock (&mutex);
+}
diff --git a/app/gui/gui-message.h b/app/gui/gui-message.h
new file mode 100644
index 0000000..e866f2a
--- /dev/null
+++ b/app/gui/gui-message.h
@@ -0,0 +1,29 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_MESSAGE_H__
+#define __GUI_MESSAGE_H__
+
+
+void gui_message (Gimp                *gimp,
+                  GObject             *handler,
+                  GimpMessageSeverity  severity,
+                  const gchar         *domain,
+                  const gchar         *message);
+
+
+#endif /* __GUI_VTABLE_H__ */
diff --git a/app/gui/gui-types.h b/app/gui/gui-types.h
new file mode 100644
index 0000000..82e9f20
--- /dev/null
+++ b/app/gui/gui-types.h
@@ -0,0 +1,27 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_TYPES_H__
+#define __GUI_TYPES_H__
+
+
+#include "tools/tools-types.h"
+#include "dialogs/dialogs-types.h"
+#include "menus/menus-types.h"
+
+
+#endif /* __GUI_TYPES_H__ */
diff --git a/app/gui/gui-unique.c b/app/gui/gui-unique.c
new file mode 100644
index 0000000..c54a05b
--- /dev/null
+++ b/app/gui/gui-unique.c
@@ -0,0 +1,442 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#ifdef G_OS_WIN32
+#include <windows.h>
+#endif
+
+#ifdef GDK_WINDOWING_QUARTZ
+#import <AppKit/AppKit.h>
+#include <gtkosxapplication.h>
+#endif
+
+#include "gui/gui-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpcontainer.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplayshell.h"
+#include "display/gimpimagewindow.h"
+
+#include "file/file-open.h"
+
+#include "gimpdbusservice.h"
+#include "gui-unique.h"
+
+
+#ifdef G_OS_WIN32
+
+static void  gui_unique_win32_init (Gimp *gimp);
+static void  gui_unique_win32_exit (void);
+
+static Gimp *unique_gimp  = NULL;
+static HWND  proxy_window = NULL;
+
+#elif defined (GDK_WINDOWING_QUARTZ)
+
+static void gui_unique_quartz_init (Gimp *gimp);
+static void gui_unique_quartz_exit (void);
+
+@interface GimpAppleEventHandler : NSObject {}
+- (void) handleEvent:(NSAppleEventDescriptor *) inEvent
+        andReplyWith:(NSAppleEventDescriptor *) replyEvent;
+@end
+
+static Gimp                   *unique_gimp   = NULL;
+static GimpAppleEventHandler  *event_handler = NULL;
+
+#else
+
+static void  gui_dbus_service_init (Gimp *gimp);
+static void  gui_dbus_service_exit (void);
+
+static GDBusObjectManagerServer *dbus_manager = NULL;
+static guint                     dbus_name_id = 0;
+
+#endif
+
+
+void
+gui_unique_init (Gimp *gimp)
+{
+#ifdef G_OS_WIN32
+  gui_unique_win32_init (gimp);
+#elif defined (GDK_WINDOWING_QUARTZ)
+  gui_unique_quartz_init (gimp);
+#else
+  gui_dbus_service_init (gimp);
+#endif
+}
+
+void
+gui_unique_exit (void)
+{
+#ifdef G_OS_WIN32
+  gui_unique_win32_exit ();
+#elif defined (GDK_WINDOWING_QUARTZ)
+  gui_unique_quartz_exit ();
+#else
+  gui_dbus_service_exit ();
+#endif
+}
+
+
+#ifdef G_OS_WIN32
+
+typedef struct
+{
+  GFile    *file;
+  gboolean  as_new;
+} IdleOpenData;
+
+static IdleOpenData *
+idle_open_data_new (GFile    *file,
+                    gboolean  as_new)
+{
+  IdleOpenData *data = g_slice_new0 (IdleOpenData);
+
+  data->file   = g_object_ref (file);
+  data->as_new = as_new;
+
+  return data;
+}
+
+static void
+idle_open_data_free (IdleOpenData *data)
+{
+  g_object_unref (data->file);
+  g_slice_free (IdleOpenData, data);
+}
+
+static gboolean
+gui_unique_win32_idle_open (IdleOpenData *data)
+{
+  /*  We want to be called again later in case that GIMP is not fully
+   *  started yet.
+   */
+  if (! gimp_is_restored (unique_gimp))
+    return TRUE;
+
+  if (data->file)
+    {
+      file_open_from_command_line (unique_gimp, data->file,
+                                   data->as_new, NULL, 0);
+    }
+  else
+    {
+      /*  raise the first display  */
+      GimpObject *display;
+
+      display = gimp_container_get_first_child (unique_gimp->displays);
+
+      gimp_display_shell_present (gimp_display_get_shell (GIMP_DISPLAY (display)));
+    }
+
+  return FALSE;
+}
+
+static LRESULT CALLBACK
+gui_unique_win32_message_handler (HWND   hWnd,
+                                  UINT   uMsg,
+                                  WPARAM wParam,
+                                  LPARAM lParam)
+{
+  switch (uMsg)
+    {
+    case WM_COPYDATA:
+      if (unique_gimp)
+        {
+          COPYDATASTRUCT *copydata = (COPYDATASTRUCT *) lParam;
+          GimpObject     *display;
+
+          if (copydata->cbData > 0)
+            {
+              GSource        *source;
+              GClosure       *closure;
+              GFile          *file;
+              IdleOpenData   *data;
+
+              file = g_file_new_for_uri (copydata->lpData);
+
+              data = idle_open_data_new (file,
+                                         copydata->dwData != 0);
+
+              g_object_unref (file);
+
+              closure = g_cclosure_new (G_CALLBACK (gui_unique_win32_idle_open),
+                                        data,
+                                        (GClosureNotify) idle_open_data_free);
+
+              g_object_watch_closure (G_OBJECT (unique_gimp), closure);
+
+              source = g_idle_source_new ();
+              g_source_set_priority (source, G_PRIORITY_LOW);
+              g_source_set_closure (source, closure);
+              g_source_attach (source, NULL);
+              g_source_unref (source);
+            }
+
+          /* Deiconify the window if minimized. */
+          display = gimp_container_get_first_child (unique_gimp->displays);
+          if (display)
+            gimp_display_shell_present (gimp_display_get_shell (GIMP_DISPLAY (display)));
+        }
+      return TRUE;
+
+    default:
+      return DefWindowProcW (hWnd, uMsg, wParam, lParam);
+    }
+}
+
+static void
+gui_unique_win32_init (Gimp *gimp)
+{
+  WNDCLASSW wc;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (unique_gimp == NULL);
+
+  unique_gimp = gimp;
+
+  /* register window class for proxy window */
+  memset (&wc, 0, sizeof (wc));
+
+  wc.hInstance     = GetModuleHandle (NULL);
+  wc.lpfnWndProc   = gui_unique_win32_message_handler;
+  wc.lpszClassName = GIMP_UNIQUE_WIN32_WINDOW_CLASS;
+
+  RegisterClassW (&wc);
+
+  proxy_window = CreateWindowExW (0,
+                                  GIMP_UNIQUE_WIN32_WINDOW_CLASS,
+                                  GIMP_UNIQUE_WIN32_WINDOW_NAME,
+                                  WS_POPUP, 0, 0, 1, 1, NULL, NULL, wc.hInstance, NULL);
+}
+
+static void
+gui_unique_win32_exit (void)
+{
+  g_return_if_fail (GIMP_IS_GIMP (unique_gimp));
+
+  unique_gimp = NULL;
+
+  DestroyWindow (proxy_window);
+}
+
+#elif defined (GDK_WINDOWING_QUARTZ)
+
+static gboolean
+gui_unique_quartz_idle_open (GFile *file)
+{
+  /*  We want to be called again later in case that GIMP is not fully
+   *  started yet.
+   */
+  if (! gimp_is_restored (unique_gimp))
+    return TRUE;
+
+  if (file)
+    {
+      file_open_from_command_line (unique_gimp, file, FALSE, NULL, 0);
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gui_unique_quartz_nsopen_file_callback (GtkosxApplication *osx_app,
+                                        gchar             *path,
+                                        gpointer           user_data)
+{
+  GSource  *source;
+  GClosure *closure;
+
+  closure = g_cclosure_new (G_CALLBACK (gui_unique_quartz_idle_open),
+                            g_file_new_for_path (path),
+                            (GClosureNotify) g_object_unref);
+
+  g_object_watch_closure (G_OBJECT (unique_gimp), closure);
+
+  source = g_idle_source_new ();
+
+  g_source_set_priority (source, G_PRIORITY_LOW);
+  g_source_set_closure (source, closure);
+  g_source_attach (source, NULL);
+  g_source_unref (source);
+
+  return TRUE;
+}
+
+@implementation GimpAppleEventHandler
+- (void) handleEvent: (NSAppleEventDescriptor *) inEvent
+        andReplyWith: (NSAppleEventDescriptor *) replyEvent
+{
+  NSAutoreleasePool *urlpool;
+  NSInteger          count;
+  NSInteger          i;
+
+  urlpool = [[NSAutoreleasePool alloc] init];
+
+  count = [inEvent numberOfItems];
+
+  for (i = 1; i <= count; i++)
+    {
+      NSURL       *url;
+      const gchar *path;
+      GSource     *source;
+      GClosure    *closure;
+
+      url = [NSURL URLWithString: [[inEvent descriptorAtIndex: i] stringValue]];
+      path = [[url path] UTF8String];
+
+      closure = g_cclosure_new (G_CALLBACK (gui_unique_quartz_idle_open),
+                                g_file_new_for_path (path),
+                                (GClosureNotify) g_object_unref);
+
+      g_object_watch_closure (G_OBJECT (unique_gimp), closure);
+
+      source = g_idle_source_new ();
+      g_source_set_priority (source, G_PRIORITY_LOW);
+      g_source_set_closure (source, closure);
+      g_source_attach (source, NULL);
+      g_source_unref (source);
+    }
+
+  [urlpool drain];
+}
+@end
+
+static void
+gui_unique_quartz_init (Gimp *gimp)
+{
+  GtkosxApplication *osx_app;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (unique_gimp == NULL);
+
+  osx_app = gtkosx_application_get ();
+
+  unique_gimp = gimp;
+
+  g_signal_connect (osx_app, "NSApplicationOpenFile",
+                    G_CALLBACK (gui_unique_quartz_nsopen_file_callback),
+                    gimp);
+
+  /* Using the event handler is a hack, it is necessary because
+   * gtkosx_application will drop the file open events if any
+   * event processing is done before gtkosx_application_ready is
+   * called, which we unfortuantly can't avoid doing right now.
+   */
+  event_handler = [[GimpAppleEventHandler alloc] init];
+
+  [[NSAppleEventManager sharedAppleEventManager]
+      setEventHandler: event_handler
+          andSelector: @selector (handleEvent: andReplyWith:)
+        forEventClass: kCoreEventClass
+           andEventID: kAEOpenDocuments];
+}
+
+static void
+gui_unique_quartz_exit (void)
+{
+  g_return_if_fail (GIMP_IS_GIMP (unique_gimp));
+
+  unique_gimp = NULL;
+
+  [[NSAppleEventManager sharedAppleEventManager]
+      removeEventHandlerForEventClass: kCoreEventClass
+                           andEventID: kAEOpenDocuments];
+
+  [event_handler release];
+
+  event_handler = NULL;
+}
+
+#else
+
+static void
+gui_dbus_bus_acquired (GDBusConnection *connection,
+                       const gchar     *name,
+                       Gimp            *gimp)
+{
+  GDBusObjectSkeleton *object;
+  GObject             *service;
+
+  /* this should use GIMP_DBUS_SERVICE_PATH, but that's historically wrong */
+  dbus_manager = g_dbus_object_manager_server_new ("/org/gimp/GIMP");
+
+  object = g_dbus_object_skeleton_new (GIMP_DBUS_INTERFACE_PATH);
+
+  service = gimp_dbus_service_new (gimp);
+  g_dbus_object_skeleton_add_interface (object,
+                                        G_DBUS_INTERFACE_SKELETON (service));
+  g_object_unref (service);
+
+  g_dbus_object_manager_server_export (dbus_manager, object);
+  g_object_unref (object);
+
+  g_dbus_object_manager_server_set_connection (dbus_manager, connection);
+}
+
+static void
+gui_dbus_name_acquired (GDBusConnection *connection,
+                        const gchar     *name,
+                        Gimp            *gimp)
+{
+}
+
+static void
+gui_dbus_name_lost (GDBusConnection *connection,
+                    const gchar     *name,
+                    Gimp            *gimp)
+{
+  if (connection == NULL)
+    g_printerr ("%s: connection to the bus cannot be established.\n",
+                G_STRFUNC);
+  else
+    g_printerr ("%s: the name \"%s\" could not be acquired on the bus.\n",
+                G_STRFUNC, name);
+}
+
+static void
+gui_dbus_service_init (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (dbus_name_id == 0);
+
+  dbus_name_id = g_bus_own_name (G_BUS_TYPE_SESSION,
+                                 GIMP_DBUS_SERVICE_NAME,
+                                 G_BUS_NAME_OWNER_FLAGS_NONE,
+                                 (GBusAcquiredCallback) gui_dbus_bus_acquired,
+                                 (GBusNameAcquiredCallback) gui_dbus_name_acquired,
+                                 (GBusNameLostCallback) gui_dbus_name_lost,
+                                 gimp, NULL);
+}
+
+static void
+gui_dbus_service_exit (void)
+{
+  g_bus_unown_name (dbus_name_id);
+  g_clear_object (&dbus_manager);
+}
+
+#endif
diff --git a/app/gui/gui-unique.h b/app/gui/gui-unique.h
new file mode 100644
index 0000000..73b9231
--- /dev/null
+++ b/app/gui/gui-unique.h
@@ -0,0 +1,31 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_UNIQUE_H__
+#define __GUI_UNIQUE_H__
+
+#ifdef G_OS_WIN32
+#define GIMP_UNIQUE_WIN32_WINDOW_CLASS  L"GimpWin32UniqueHandler"
+#define GIMP_UNIQUE_WIN32_WINDOW_NAME   L"GimpProxy"
+#endif
+
+
+void  gui_unique_init (Gimp *gimp);
+void  gui_unique_exit (void);
+
+
+#endif /* __GUI_UNIQUE_H__ */
diff --git a/app/gui/gui-vtable.c b/app/gui/gui-vtable.c
new file mode 100644
index 0000000..28c999a
--- /dev/null
+++ b/app/gui/gui-vtable.c
@@ -0,0 +1,934 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include <errno.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+
+#ifdef G_OS_WIN32
+#include <windows.h>
+#include <fcntl.h>
+#include <io.h>
+
+#ifndef pipe
+#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
+#endif
+#else
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#endif
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gui-types.h"
+
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimp-parallel.h"
+#include "core/gimp-spawn.h"
+#include "core/gimp-utils.h"
+#include "core/gimpasync.h"
+#include "core/gimpbrush.h"
+#include "core/gimpcancelable.h"
+#include "core/gimpcontainer.h"
+#include "core/gimpcontext.h"
+#include "core/gimpgradient.h"
+#include "core/gimpimage.h"
+#include "core/gimpimagefile.h"
+#include "core/gimplist.h"
+#include "core/gimppalette.h"
+#include "core/gimppattern.h"
+#include "core/gimpprogress.h"
+#include "core/gimpwaitable.h"
+
+#include "text/gimpfont.h"
+
+#include "pdb/gimppdb.h"
+#include "pdb/gimpprocedure.h"
+
+#include "plug-in/gimppluginmanager-file.h"
+
+#include "widgets/gimpactiongroup.h"
+#include "widgets/gimpbrushselect.h"
+#include "widgets/gimpdialogfactory.h"
+#include "widgets/gimpdocked.h"
+#include "widgets/gimpfontselect.h"
+#include "widgets/gimpgradientselect.h"
+#include "widgets/gimphelp.h"
+#include "widgets/gimphelp-ids.h"
+#include "widgets/gimpmenufactory.h"
+#include "widgets/gimppaletteselect.h"
+#include "widgets/gimppatternselect.h"
+#include "widgets/gimpprogressdialog.h"
+#include "widgets/gimpuimanager.h"
+#include "widgets/gimpwidgets-utils.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplay-foreach.h"
+#include "display/gimpdisplayshell.h"
+#include "display/gimpsinglewindowstrategy.h"
+#include "display/gimpmultiwindowstrategy.h"
+
+#include "actions/plug-in-actions.h"
+
+#include "menus/menus.h"
+
+#include "dialogs/color-profile-import-dialog.h"
+
+#include "gui.h"
+#include "gui-message.h"
+#include "gui-vtable.h"
+#include "icon-themes.h"
+#include "themes.h"
+
+
+/*  local function prototypes  */
+
+static void           gui_ungrab                 (Gimp                *gimp);
+
+static void           gui_threads_enter          (Gimp                *gimp);
+static void           gui_threads_leave          (Gimp                *gimp);
+
+static void           gui_set_busy               (Gimp                *gimp);
+static void           gui_unset_busy             (Gimp                *gimp);
+
+static void           gui_help                   (Gimp                *gimp,
+                                                  GimpProgress        *progress,
+                                                  const gchar         *help_domain,
+                                                  const gchar         *help_id);
+static const gchar  * gui_get_program_class      (Gimp                *gimp);
+static gchar        * gui_get_display_name       (Gimp                *gimp,
+                                                  gint                 display_ID,
+                                                  GObject            **screen,
+                                                  gint                *monitor);
+static guint32        gui_get_user_time          (Gimp                *gimp);
+static GFile        * gui_get_theme_dir          (Gimp                *gimp);
+static GFile        * gui_get_icon_theme_dir     (Gimp                *gimp);
+static GimpObject   * gui_get_window_strategy    (Gimp                *gimp);
+static GimpObject   * gui_get_empty_display      (Gimp                *gimp);
+static GimpObject   * gui_display_get_by_ID      (Gimp                *gimp,
+                                                  gint                 ID);
+static gint           gui_display_get_ID         (GimpObject          *display);
+static guint32        gui_display_get_window_id  (GimpObject          *display);
+static GimpObject   * gui_display_create         (Gimp                *gimp,
+                                                  GimpImage           *image,
+                                                  GimpUnit             unit,
+                                                  gdouble              scale,
+                                                  GObject             *screen,
+                                                  gint                 monitor);
+static void           gui_display_delete         (GimpObject          *display);
+static void           gui_displays_reconnect     (Gimp                *gimp,
+                                                  GimpImage           *old_image,
+                                                  GimpImage           *new_image);
+static gboolean       gui_wait                   (Gimp                *gimp,
+                                                  GimpWaitable        *waitable,
+                                                  const gchar         *message);
+static GimpProgress * gui_new_progress           (Gimp                *gimp,
+                                                  GimpObject          *display);
+static void           gui_free_progress          (Gimp                *gimp,
+                                                  GimpProgress        *progress);
+static gboolean       gui_pdb_dialog_new         (Gimp                *gimp,
+                                                  GimpContext         *context,
+                                                  GimpProgress        *progress,
+                                                  GimpContainer       *container,
+                                                  const gchar         *title,
+                                                  const gchar         *callback_name,
+                                                  const gchar         *object_name,
+                                                  va_list              args);
+static gboolean       gui_pdb_dialog_set         (Gimp                *gimp,
+                                                  GimpContainer       *container,
+                                                  const gchar         *callback_name,
+                                                  const gchar         *object_name,
+                                                  va_list              args);
+static gboolean       gui_pdb_dialog_close       (Gimp                *gimp,
+                                                  GimpContainer       *container,
+                                                  const gchar         *callback_name);
+static gboolean       gui_recent_list_add_file   (Gimp                *gimp,
+                                                  GFile               *file,
+                                                  const gchar         *mime_type);
+static void           gui_recent_list_load       (Gimp                *gimp);
+
+static GMountOperation
+                    * gui_get_mount_operation    (Gimp                *gimp,
+                                                  GimpProgress        *progress);
+
+static GimpColorProfilePolicy
+                      gui_query_profile_policy   (Gimp                *gimp,
+                                                  GimpImage           *image,
+                                                  GimpContext         *context,
+                                                  GimpColorProfile   **dest_profile,
+                                                  GimpColorRenderingIntent *intent,
+                                                  gboolean            *bpc,
+                                                  gboolean            *dont_ask);
+
+
+/*  public functions  */
+
+void
+gui_vtable_init (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  gimp->gui.ungrab                 = gui_ungrab;
+  gimp->gui.threads_enter          = gui_threads_enter;
+  gimp->gui.threads_leave          = gui_threads_leave;
+  gimp->gui.set_busy               = gui_set_busy;
+  gimp->gui.unset_busy             = gui_unset_busy;
+  gimp->gui.show_message           = gui_message;
+  gimp->gui.help                   = gui_help;
+  gimp->gui.get_program_class      = gui_get_program_class;
+  gimp->gui.get_display_name       = gui_get_display_name;
+  gimp->gui.get_user_time          = gui_get_user_time;
+  gimp->gui.get_theme_dir          = gui_get_theme_dir;
+  gimp->gui.get_icon_theme_dir     = gui_get_icon_theme_dir;
+  gimp->gui.get_window_strategy    = gui_get_window_strategy;
+  gimp->gui.get_empty_display      = gui_get_empty_display;
+  gimp->gui.display_get_by_id      = gui_display_get_by_ID;
+  gimp->gui.display_get_id         = gui_display_get_ID;
+  gimp->gui.display_get_window_id  = gui_display_get_window_id;
+  gimp->gui.display_create         = gui_display_create;
+  gimp->gui.display_delete         = gui_display_delete;
+  gimp->gui.displays_reconnect     = gui_displays_reconnect;
+  gimp->gui.wait                   = gui_wait;
+  gimp->gui.progress_new           = gui_new_progress;
+  gimp->gui.progress_free          = gui_free_progress;
+  gimp->gui.pdb_dialog_new         = gui_pdb_dialog_new;
+  gimp->gui.pdb_dialog_set         = gui_pdb_dialog_set;
+  gimp->gui.pdb_dialog_close       = gui_pdb_dialog_close;
+  gimp->gui.recent_list_add_file   = gui_recent_list_add_file;
+  gimp->gui.recent_list_load       = gui_recent_list_load;
+  gimp->gui.get_mount_operation    = gui_get_mount_operation;
+  gimp->gui.query_profile_policy   = gui_query_profile_policy;
+}
+
+
+/*  private functions  */
+
+static void
+gui_ungrab (Gimp *gimp)
+{
+  GdkDisplay *display = gdk_display_get_default ();
+
+  if (display)
+    {
+      gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME);
+      gdk_display_keyboard_ungrab (display, GDK_CURRENT_TIME);
+    }
+}
+
+static void
+gui_threads_enter (Gimp *gimp)
+{
+  GDK_THREADS_ENTER ();
+}
+
+static void
+gui_threads_leave (Gimp *gimp)
+{
+  GDK_THREADS_LEAVE ();
+}
+
+static void
+gui_set_busy (Gimp *gimp)
+{
+  gimp_displays_set_busy (gimp);
+  gimp_dialog_factory_set_busy (gimp_dialog_factory_get_singleton ());
+
+  gdk_flush ();
+}
+
+static void
+gui_unset_busy (Gimp *gimp)
+{
+  gimp_displays_unset_busy (gimp);
+  gimp_dialog_factory_unset_busy (gimp_dialog_factory_get_singleton ());
+
+  gdk_flush ();
+}
+
+static void
+gui_help (Gimp         *gimp,
+          GimpProgress *progress,
+          const gchar  *help_domain,
+          const gchar  *help_id)
+{
+  gimp_help_show (gimp, progress, help_domain, help_id);
+}
+
+static const gchar *
+gui_get_program_class (Gimp *gimp)
+{
+  return gdk_get_program_class ();
+}
+
+static gchar *
+gui_get_display_name (Gimp     *gimp,
+                      gint      display_ID,
+                      GObject **screen,
+                      gint     *monitor)
+{
+  GimpDisplay *display   = NULL;
+  GdkScreen   *my_screen = NULL;
+
+  if (display_ID > 0)
+    display = gimp_display_get_by_ID (gimp, display_ID);
+
+  if (display)
+    {
+      GimpDisplayShell *shell  = gimp_display_get_shell (display);
+      GdkWindow        *window = gtk_widget_get_window (GTK_WIDGET (shell));
+
+      my_screen = gtk_widget_get_screen (GTK_WIDGET (shell));
+      *monitor = gdk_screen_get_monitor_at_window (my_screen, window);
+    }
+  else
+    {
+      *monitor = gui_get_initial_monitor (gimp, &my_screen);
+
+      if (*monitor == -1)
+        *monitor = gimp_get_monitor_at_pointer (&my_screen);
+    }
+
+  *screen = G_OBJECT (my_screen);
+
+  if (my_screen)
+    return gdk_screen_make_display_name (my_screen);
+
+  return NULL;
+}
+
+static guint32
+gui_get_user_time (Gimp *gimp)
+{
+#ifdef GDK_WINDOWING_X11
+  return gdk_x11_display_get_user_time (gdk_display_get_default ());
+#endif
+  return 0;
+}
+
+static GFile *
+gui_get_theme_dir (Gimp *gimp)
+{
+  return themes_get_theme_dir (gimp, GIMP_GUI_CONFIG (gimp->config)->theme);
+}
+
+static GFile *
+gui_get_icon_theme_dir (Gimp *gimp)
+{
+  return icon_themes_get_theme_dir (gimp, GIMP_GUI_CONFIG (gimp->config)->icon_theme);
+}
+
+static GimpObject *
+gui_get_window_strategy (Gimp *gimp)
+{
+  if (GIMP_GUI_CONFIG (gimp->config)->single_window_mode)
+    return gimp_single_window_strategy_get_singleton ();
+  else
+    return gimp_multi_window_strategy_get_singleton ();
+}
+
+static GimpObject *
+gui_get_empty_display (Gimp *gimp)
+{
+  GimpObject *display = NULL;
+
+  if (gimp_container_get_n_children (gimp->displays) == 1)
+    {
+      display = gimp_container_get_first_child (gimp->displays);
+
+      if (gimp_display_get_image (GIMP_DISPLAY (display)))
+        {
+          /* The display was not empty */
+          display = NULL;
+        }
+    }
+
+  return display;
+}
+
+static GimpObject *
+gui_display_get_by_ID (Gimp *gimp,
+                       gint  ID)
+{
+  return (GimpObject *) gimp_display_get_by_ID (gimp, ID);
+}
+
+static gint
+gui_display_get_ID (GimpObject *display)
+{
+  return gimp_display_get_ID (GIMP_DISPLAY (display));
+}
+
+static guint32
+gui_display_get_window_id (GimpObject *display)
+{
+  GimpDisplay      *disp  = GIMP_DISPLAY (display);
+  GimpDisplayShell *shell = gimp_display_get_shell (disp);
+
+  if (shell)
+    {
+      GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (shell));
+
+      if (GTK_IS_WINDOW (toplevel))
+        return gimp_window_get_native_id (GTK_WINDOW (toplevel));
+    }
+
+  return 0;
+}
+
+static GimpObject *
+gui_display_create (Gimp      *gimp,
+                    GimpImage *image,
+                    GimpUnit   unit,
+                    gdouble    scale,
+                    GObject   *screen,
+                    gint       monitor)
+{
+  GimpContext *context = gimp_get_user_context (gimp);
+  GimpDisplay *display = GIMP_DISPLAY (gui_get_empty_display (gimp));
+
+  if (! screen)
+    monitor = gimp_get_monitor_at_pointer ((GdkScreen **) &screen);
+
+  if (display)
+    {
+      gimp_display_fill (display, image, unit, scale);
+    }
+  else
+    {
+      GList *image_managers = gimp_ui_managers_from_name ("<Image>");
+
+      g_return_val_if_fail (image_managers != NULL, NULL);
+
+      display = gimp_display_new (gimp, image, unit, scale,
+                                  image_managers->data,
+                                  gimp_dialog_factory_get_singleton (),
+                                  GDK_SCREEN (screen),
+                                  monitor);
+   }
+
+  if (gimp_context_get_display (context) == display)
+    {
+      gimp_context_set_image (context, image);
+      gimp_context_display_changed (context);
+    }
+  else
+    {
+      gimp_context_set_display (context, display);
+    }
+
+  return GIMP_OBJECT (display);
+}
+
+static void
+gui_display_delete (GimpObject *display)
+{
+  gimp_display_close (GIMP_DISPLAY (display));
+}
+
+static void
+gui_displays_reconnect (Gimp      *gimp,
+                        GimpImage *old_image,
+                        GimpImage *new_image)
+{
+  gimp_displays_reconnect (gimp, old_image, new_image);
+}
+
+static void
+gui_wait_input_async (GimpAsync  *async,
+                      const gint  input_pipe[2])
+{
+  guint8 buffer[1];
+
+  while (read (input_pipe[0], buffer, sizeof (buffer)) == -1 &&
+         errno == EINTR);
+
+  gimp_async_finish (async, NULL);
+}
+
+static gboolean
+gui_wait (Gimp         *gimp,
+          GimpWaitable *waitable,
+          const gchar  *message)
+{
+  GimpProcedure  *procedure;
+  GimpValueArray *args;
+  GimpAsync      *input_async = NULL;
+  GError         *error       = NULL;
+  gint            input_pipe[2];
+  gint            output_pipe[2];
+
+  procedure = gimp_pdb_lookup_procedure (gimp->pdb, "plug-in-busy-dialog");
+
+  if (! procedure)
+    return FALSE;
+
+  if (pipe (input_pipe))
+    return FALSE;
+
+  if (pipe (output_pipe))
+    {
+      close (input_pipe[0]);
+      close (input_pipe[1]);
+
+      return FALSE;
+    }
+
+  gimp_spawn_set_cloexec (input_pipe[0]);
+  gimp_spawn_set_cloexec (output_pipe[1]);
+
+  args = gimp_procedure_get_arguments (procedure);
+  gimp_value_array_truncate (args, 5);
+
+  g_value_set_int    (gimp_value_array_index (args, 0),
+                      GIMP_RUN_INTERACTIVE);
+  g_value_set_int    (gimp_value_array_index (args, 1),
+                      output_pipe[0]);
+  g_value_set_int    (gimp_value_array_index (args, 2),
+                      input_pipe[1]);
+  g_value_set_string (gimp_value_array_index (args, 3),
+                      message);
+  g_value_set_int    (gimp_value_array_index (args, 4),
+                      GIMP_IS_CANCELABLE (waitable));
+
+  gimp_procedure_execute_async (procedure, gimp,
+                                gimp_get_user_context (gimp),
+                                NULL, args, NULL, &error);
+
+  gimp_value_array_unref (args);
+
+  close (input_pipe[1]);
+  close (output_pipe[0]);
+
+  if (error)
+    {
+      g_clear_error (&error);
+
+      close (input_pipe[0]);
+      close (output_pipe[1]);
+
+      return FALSE;
+    }
+
+  if (GIMP_IS_CANCELABLE (waitable))
+    {
+      /* listens for a cancellation request */
+      input_async = gimp_parallel_run_async_independent (
+        (GimpRunAsyncFunc) gui_wait_input_async,
+        input_pipe);
+
+      while (! gimp_waitable_wait_for (waitable, 0.1 * G_TIME_SPAN_SECOND))
+        {
+          /* check for a cancellation request */
+          if (gimp_waitable_try_wait (GIMP_WAITABLE (input_async)))
+            {
+              gimp_cancelable_cancel (GIMP_CANCELABLE (waitable));
+
+              break;
+            }
+        }
+    }
+
+  gimp_waitable_wait (waitable);
+
+  /* signal completion to the plug-in */
+  close (output_pipe[1]);
+
+  if (input_async)
+    {
+      gimp_waitable_wait (GIMP_WAITABLE (input_async));
+
+      g_object_unref (input_async);
+    }
+
+  close (input_pipe[0]);
+
+  return TRUE;
+}
+
+static GimpProgress *
+gui_new_progress (Gimp       *gimp,
+                  GimpObject *display)
+{
+  g_return_val_if_fail (display == NULL || GIMP_IS_DISPLAY (display), NULL);
+
+  if (display)
+    return GIMP_PROGRESS (display);
+
+  return GIMP_PROGRESS (gimp_progress_dialog_new ());
+}
+
+static void
+gui_free_progress (Gimp          *gimp,
+                   GimpProgress  *progress)
+{
+  g_return_if_fail (GIMP_IS_PROGRESS_DIALOG (progress));
+
+  if (GIMP_IS_PROGRESS_DIALOG (progress))
+    gtk_widget_destroy (GTK_WIDGET (progress));
+}
+
+static gboolean
+gui_pdb_dialog_present (GtkWindow *window)
+{
+  gtk_window_present (window);
+
+  return FALSE;
+}
+
+static gboolean
+gui_pdb_dialog_new (Gimp          *gimp,
+                    GimpContext   *context,
+                    GimpProgress  *progress,
+                    GimpContainer *container,
+                    const gchar   *title,
+                    const gchar   *callback_name,
+                    const gchar   *object_name,
+                    va_list        args)
+{
+  GType        dialog_type = G_TYPE_NONE;
+  const gchar *dialog_role = NULL;
+  const gchar *help_id     = NULL;
+
+  if (gimp_container_get_children_type (container) == GIMP_TYPE_BRUSH)
+    {
+      dialog_type = GIMP_TYPE_BRUSH_SELECT;
+      dialog_role = "gimp-brush-selection";
+      help_id     = GIMP_HELP_BRUSH_DIALOG;
+    }
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_FONT)
+    {
+      dialog_type = GIMP_TYPE_FONT_SELECT;
+      dialog_role = "gimp-font-selection";
+      help_id     = GIMP_HELP_FONT_DIALOG;
+    }
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_GRADIENT)
+    {
+      dialog_type = GIMP_TYPE_GRADIENT_SELECT;
+      dialog_role = "gimp-gradient-selection";
+      help_id     = GIMP_HELP_GRADIENT_DIALOG;
+    }
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PALETTE)
+    {
+      dialog_type = GIMP_TYPE_PALETTE_SELECT;
+      dialog_role = "gimp-palette-selection";
+      help_id     = GIMP_HELP_PALETTE_DIALOG;
+    }
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PATTERN)
+    {
+      dialog_type = GIMP_TYPE_PATTERN_SELECT;
+      dialog_role = "gimp-pattern-selection";
+      help_id     = GIMP_HELP_PATTERN_DIALOG;
+    }
+
+  if (dialog_type != G_TYPE_NONE)
+    {
+      GimpObject *object = NULL;
+
+      if (object_name && strlen (object_name))
+        object = gimp_container_get_child_by_name (container, object_name);
+
+      if (! object)
+        object = gimp_context_get_by_type (context,
+                                           gimp_container_get_children_type (container));
+
+      if (object)
+        {
+          gint        n_properties = 0;
+          gchar     **names        = NULL;
+          GValue     *values       = NULL;
+          GtkWidget  *dialog;
+          GtkWidget  *view;
+
+          names = gimp_properties_append (dialog_type,
+                                          &n_properties, names, &values,
+                                          "title",          title,
+                                          "role",           dialog_role,
+                                          "help-func",      gimp_standard_help_func,
+                                          "help-id",        help_id,
+                                          "pdb",            gimp->pdb,
+                                          "context",        context,
+                                          "select-type",    gimp_container_get_children_type (container),
+                                          "initial-object", object,
+                                          "callback-name",  callback_name,
+                                          "menu-factory",   global_menu_factory,
+                                          NULL);
+
+          names = gimp_properties_append_valist (dialog_type,
+                                                 &n_properties, names, &values,
+                                                 args);
+
+          dialog = (GtkWidget *)
+            g_object_new_with_properties (dialog_type,
+                                          n_properties,
+                                          (const gchar **) names,
+                                          (const GValue *) values);
+
+          gimp_properties_free (n_properties, names, values);
+
+          view = GIMP_PDB_DIALOG (dialog)->view;
+          if (view)
+            gimp_docked_set_show_button_bar (GIMP_DOCKED (view), FALSE);
+
+          if (progress)
+            {
+              guint32 window_id = gimp_progress_get_window_id (progress);
+
+              if (window_id)
+                gimp_window_set_transient_for (GTK_WINDOW (dialog), window_id);
+            }
+
+          gtk_widget_show (dialog);
+
+          /*  workaround for bug #360106  */
+          {
+            GSource  *source = g_timeout_source_new (100);
+            GClosure *closure;
+
+            closure = g_cclosure_new_object (G_CALLBACK (gui_pdb_dialog_present),
+                                             G_OBJECT (dialog));
+
+            g_source_set_closure (source, closure);
+            g_source_attach (source, NULL);
+            g_source_unref (source);
+          }
+
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gui_pdb_dialog_set (Gimp          *gimp,
+                    GimpContainer *container,
+                    const gchar   *callback_name,
+                    const gchar   *object_name,
+                    va_list        args)
+{
+  GimpPdbDialogClass *klass = NULL;
+
+  if (gimp_container_get_children_type (container) == GIMP_TYPE_BRUSH)
+    klass = g_type_class_peek (GIMP_TYPE_BRUSH_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_FONT)
+    klass = g_type_class_peek (GIMP_TYPE_FONT_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_GRADIENT)
+    klass = g_type_class_peek (GIMP_TYPE_GRADIENT_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PALETTE)
+    klass = g_type_class_peek (GIMP_TYPE_PALETTE_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PATTERN)
+    klass = g_type_class_peek (GIMP_TYPE_PATTERN_SELECT);
+
+  if (klass)
+    {
+      GimpPdbDialog *dialog;
+
+      dialog = gimp_pdb_dialog_get_by_callback (klass, callback_name);
+
+      if (dialog && dialog->select_type == gimp_container_get_children_type (container))
+        {
+          GimpObject *object;
+
+          object = gimp_container_get_child_by_name (container, object_name);
+
+          if (object)
+            {
+              const gchar *prop_name = va_arg (args, const gchar *);
+
+              gimp_context_set_by_type (dialog->context, dialog->select_type,
+                                        object);
+
+              if (prop_name)
+                g_object_set_valist (G_OBJECT (dialog), prop_name, args);
+
+              gtk_window_present (GTK_WINDOW (dialog));
+
+              return TRUE;
+            }
+        }
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gui_pdb_dialog_close (Gimp          *gimp,
+                      GimpContainer *container,
+                      const gchar   *callback_name)
+{
+  GimpPdbDialogClass *klass = NULL;
+
+  if (gimp_container_get_children_type (container) == GIMP_TYPE_BRUSH)
+    klass = g_type_class_peek (GIMP_TYPE_BRUSH_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_FONT)
+    klass = g_type_class_peek (GIMP_TYPE_FONT_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_GRADIENT)
+    klass = g_type_class_peek (GIMP_TYPE_GRADIENT_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PALETTE)
+    klass = g_type_class_peek (GIMP_TYPE_PALETTE_SELECT);
+  else if (gimp_container_get_children_type (container) == GIMP_TYPE_PATTERN)
+    klass = g_type_class_peek (GIMP_TYPE_PATTERN_SELECT);
+
+  if (klass)
+    {
+      GimpPdbDialog *dialog;
+
+      dialog = gimp_pdb_dialog_get_by_callback (klass, callback_name);
+
+      if (dialog && dialog->select_type == gimp_container_get_children_type (container))
+        {
+          gtk_widget_destroy (GTK_WIDGET (dialog));
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static gboolean
+gui_recent_list_add_file (Gimp        *gimp,
+                          GFile       *file,
+                          const gchar *mime_type)
+{
+  GtkRecentData  recent;
+  const gchar   *groups[2] = { "Graphics", NULL };
+  gchar         *uri;
+  gboolean       success;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), FALSE);
+  g_return_val_if_fail (G_IS_FILE (file), FALSE);
+
+  /* use last part of the URI */
+  recent.display_name = NULL;
+
+  /* no special description */
+  recent.description  = NULL;
+  recent.mime_type    = (mime_type ?
+                         (gchar *) mime_type : "application/octet-stream");
+  recent.app_name     = "GNU Image Manipulation Program";
+  recent.app_exec     = GIMP_COMMAND " %u";
+  recent.groups       = (gchar **) groups;
+  recent.is_private   = FALSE;
+
+  uri = g_file_get_uri (file);
+
+  success = gtk_recent_manager_add_full (gtk_recent_manager_get_default (),
+                                         uri, &recent);
+
+  g_free (uri);
+
+  return success;
+}
+
+static gint
+gui_recent_list_compare (gconstpointer a,
+                         gconstpointer b)
+{
+  return (gtk_recent_info_get_modified ((GtkRecentInfo *) a) -
+          gtk_recent_info_get_modified ((GtkRecentInfo *) b));
+}
+
+static void
+gui_recent_list_load (Gimp *gimp)
+{
+  GList *items;
+  GList *list;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  gimp_container_freeze (gimp->documents);
+  gimp_container_clear (gimp->documents);
+
+  items = gtk_recent_manager_get_items (gtk_recent_manager_get_default ());
+
+  items = g_list_sort (items, gui_recent_list_compare);
+
+  for (list = items; list; list = list->next)
+    {
+      GtkRecentInfo *info = list->data;
+
+      if (gtk_recent_info_has_application (info,
+                                           "GNU Image Manipulation Program"))
+        {
+          const gchar *mime_type = gtk_recent_info_get_mime_type (info);
+
+          if (mime_type &&
+              gimp_plug_in_manager_file_procedure_find_by_mime_type (gimp->plug_in_manager,
+                                                                     GIMP_FILE_PROCEDURE_GROUP_OPEN,
+                                                                     mime_type))
+            {
+              GimpImagefile *imagefile;
+              GFile         *file;
+
+              file = g_file_new_for_uri (gtk_recent_info_get_uri (info));
+              imagefile = gimp_imagefile_new (gimp, file);
+              g_object_unref (file);
+
+              gimp_imagefile_set_mime_type (imagefile, mime_type);
+
+              gimp_container_add (gimp->documents, GIMP_OBJECT (imagefile));
+              g_object_unref (imagefile);
+            }
+        }
+
+      gtk_recent_info_unref (info);
+    }
+
+  g_list_free (items);
+
+  gimp_container_thaw (gimp->documents);
+}
+
+static GMountOperation *
+gui_get_mount_operation (Gimp         *gimp,
+                         GimpProgress *progress)
+{
+  GtkWidget *toplevel = NULL;
+
+  if (GTK_IS_WIDGET (progress))
+    toplevel = gtk_widget_get_toplevel (GTK_WIDGET (progress));
+
+  return gtk_mount_operation_new (GTK_WINDOW (toplevel));
+}
+
+static GimpColorProfilePolicy
+gui_query_profile_policy (Gimp                      *gimp,
+                          GimpImage                 *image,
+                          GimpContext               *context,
+                          GimpColorProfile         **dest_profile,
+                          GimpColorRenderingIntent  *intent,
+                          gboolean                  *bpc,
+                          gboolean                  *dont_ask)
+{
+  return color_profile_import_dialog_run (image, context, NULL,
+                                          dest_profile,
+                                          intent, bpc,
+                                          dont_ask);
+}
diff --git a/app/gui/gui-vtable.h b/app/gui/gui-vtable.h
new file mode 100644
index 0000000..e52009b
--- /dev/null
+++ b/app/gui/gui-vtable.h
@@ -0,0 +1,31 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_VTABLE_H__
+#define __GUI_VTABLE_H__
+
+
+void   gui_vtable_init        (Gimp       *gimp);
+
+/*  this function lives in gui.c but must only be used from gui-vtable.c;
+ *  also, gui.h can't contain any Gdk types.
+ */
+gint  gui_get_initial_monitor (Gimp       *gimp,
+                               GdkScreen **screen);
+
+
+#endif /* __GUI_VTABLE_H__ */
diff --git a/app/gui/gui.c b/app/gui/gui.c
new file mode 100644
index 0000000..6fd6b95
--- /dev/null
+++ b/app/gui/gui.c
@@ -0,0 +1,1064 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpwidgets/gimpwidgets.h"
+#include "libgimpwidgets/gimpwidgets-private.h"
+
+#include "gui-types.h"
+
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimpcontainer.h"
+#include "core/gimpcontext.h"
+#include "core/gimpimage.h"
+#include "core/gimptoolinfo.h"
+
+#include "plug-in/gimpenvirontable.h"
+#include "plug-in/gimppluginmanager.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplay-foreach.h"
+#include "display/gimpdisplayshell.h"
+#include "display/gimpstatusbar.h"
+
+#include "tools/gimp-tools.h"
+#include "tools/gimptool.h"
+#include "tools/tool_manager.h"
+
+#include "widgets/gimpaction.h"
+#include "widgets/gimpactiongroup.h"
+#include "widgets/gimpaction-history.h"
+#include "widgets/gimpclipboard.h"
+#include "widgets/gimpcolorselectorpalette.h"
+#include "widgets/gimpcontrollers.h"
+#include "widgets/gimpdevices.h"
+#include "widgets/gimpdialogfactory.h"
+#include "widgets/gimpdnd.h"
+#include "widgets/gimprender.h"
+#include "widgets/gimphelp.h"
+#include "widgets/gimphelp-ids.h"
+#include "widgets/gimpmenufactory.h"
+#include "widgets/gimpmessagebox.h"
+#include "widgets/gimpsessioninfo.h"
+#include "widgets/gimpuimanager.h"
+#include "widgets/gimpwidgets-utils.h"
+#include "widgets/gimplanguagestore-parser.h"
+
+#include "actions/actions.h"
+#include "actions/windows-commands.h"
+
+#include "menus/menus.h"
+
+#include "dialogs/dialogs.h"
+
+#include "gimpuiconfigurer.h"
+#include "gui.h"
+#include "gui-unique.h"
+#include "gui-vtable.h"
+#include "icon-themes.h"
+#include "session.h"
+#include "splash.h"
+#include "themes.h"
+
+#ifdef GDK_WINDOWING_QUARTZ
+#import <AppKit/AppKit.h>
+#include <gtkosxapplication.h>
+
+/* Forward declare since we are building against old SDKs. */
+#if !defined(MAC_OS_X_VERSION_10_12) || \
+    MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
+
+@interface NSWindow(ForwardDeclarations)
++ (void)setAllowsAutomaticWindowTabbing:(BOOL)allow;
+@end
+
+#endif
+
+#endif /* GDK_WINDOWING_QUARTZ */
+
+#include "gimp-intl.h"
+
+
+/*  local function prototypes  */
+
+static gchar    * gui_sanity_check              (void);
+static void       gui_help_func                 (const gchar        *help_id,
+                                                 gpointer            help_data);
+static gboolean   gui_get_background_func       (GimpRGB            *color);
+static gboolean   gui_get_foreground_func       (GimpRGB            *color);
+
+static void       gui_initialize_after_callback (Gimp               *gimp,
+                                                 GimpInitStatusFunc  callback);
+
+static void       gui_restore_callback          (Gimp               *gimp,
+                                                 GimpInitStatusFunc  callback);
+static void       gui_restore_after_callback    (Gimp               *gimp,
+                                                 GimpInitStatusFunc  callback);
+
+static gboolean   gui_exit_callback             (Gimp               *gimp,
+                                                 gboolean            force);
+static gboolean   gui_exit_after_callback       (Gimp               *gimp,
+                                                 gboolean            force);
+
+static void       gui_show_tooltips_notify      (GimpGuiConfig      *gui_config,
+                                                 GParamSpec         *pspec,
+                                                 Gimp               *gimp);
+static void       gui_show_help_button_notify   (GimpGuiConfig      *gui_config,
+                                                 GParamSpec         *pspec,
+                                                 Gimp               *gimp);
+static void       gui_user_manual_notify        (GimpGuiConfig      *gui_config,
+                                                 GParamSpec         *pspec,
+                                                 Gimp               *gimp);
+static void       gui_single_window_mode_notify (GimpGuiConfig      *gui_config,
+                                                 GParamSpec         *pspec,
+                                                 GimpUIConfigurer   *ui_configurer);
+static void       gui_tearoff_menus_notify      (GimpGuiConfig      *gui_config,
+                                                 GParamSpec         *pspec,
+                                                 GtkUIManager       *manager);
+
+static void       gui_clipboard_changed         (Gimp               *gimp);
+
+static void       gui_menu_show_tooltip         (GimpUIManager      *manager,
+                                                 const gchar        *tooltip,
+                                                 Gimp               *gimp);
+static void       gui_menu_hide_tooltip         (GimpUIManager      *manager,
+                                                 Gimp               *gimp);
+
+static void       gui_display_changed           (GimpContext        *context,
+                                                 GimpDisplay        *display,
+                                                 Gimp               *gimp);
+
+static void       gui_compare_accelerator       (gpointer            data,
+                                                 const gchar        *accel_path,
+                                                 guint               accel_key,
+                                                 GdkModifierType     accel_mods,
+                                                 gboolean            changed);
+static void      gui_check_unique_accelerator   (gpointer            data,
+                                                 const gchar        *accel_path,
+                                                 guint               accel_key,
+                                                 GdkModifierType     accel_mods,
+                                                 gboolean            changed);
+static gboolean  gui_check_action_exists        (const gchar *accel_path);
+
+
+/*  private variables  */
+
+static Gimp             *the_gui_gimp     = NULL;
+static GimpUIManager    *image_ui_manager = NULL;
+static GimpUIConfigurer *ui_configurer    = NULL;
+static GdkScreen        *initial_screen   = NULL;
+static gint              initial_monitor  = -1;
+
+
+/*  public functions  */
+
+void
+gui_libs_init (GOptionContext *context)
+{
+  g_return_if_fail (context != NULL);
+
+  g_option_context_add_group (context, gtk_get_option_group (TRUE));
+}
+
+void
+gui_abort (const gchar *abort_message)
+{
+  GtkWidget *dialog;
+  GtkWidget *box;
+
+  g_return_if_fail (abort_message != NULL);
+
+  dialog = gimp_dialog_new (_("GIMP Message"), "gimp-abort",
+                            NULL, GTK_DIALOG_MODAL, NULL, NULL,
+
+                            _("_OK"), GTK_RESPONSE_OK,
+
+                            NULL);
+
+  gtk_window_set_resizable (GTK_WINDOW (dialog), FALSE);
+
+  box = g_object_new (GIMP_TYPE_MESSAGE_BOX,
+                      "icon-name",    GIMP_ICON_WILBER_EEK,
+                      "border-width", 12,
+                      NULL);
+
+  gimp_message_box_set_text (GIMP_MESSAGE_BOX (box), "%s", abort_message);
+
+  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
+                      box, TRUE, TRUE, 0);
+  gtk_widget_show (box);
+
+  gimp_dialog_run (GIMP_DIALOG (dialog));
+
+  exit (EXIT_FAILURE);
+}
+
+GimpInitStatusFunc
+gui_init (Gimp     *gimp,
+          gboolean  no_splash)
+{
+  GimpInitStatusFunc  status_callback = NULL;
+  gchar              *abort_message;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (the_gui_gimp == NULL, NULL);
+
+  abort_message = gui_sanity_check ();
+  if (abort_message)
+    gui_abort (abort_message);
+
+  the_gui_gimp = gimp;
+
+  /* TRANSLATORS: there is no need to translate this in GIMP. This uses
+   * "gtk20" domain as a special trick to determine language direction,
+   * but xgettext extracts it anyway mistakenly into GIMP po files.
+   * Leave an empty string as translation. It does not matter.
+   */
+  if (g_strcmp0 (dgettext ("gtk20", "default:LTR"), "default:RTL") == 0)
+    /* Normally this should have been taken care of during command line
+     * parsing as a post-parse hook of gtk_get_option_group(), using the
+     * system locales.
+     * But user config may have overridden the language, therefore we must
+     * check the widget directions again.
+     */
+    gtk_widget_set_default_direction (GTK_TEXT_DIR_RTL);
+  else
+    gtk_widget_set_default_direction (GTK_TEXT_DIR_LTR);
+
+  gui_unique_init (gimp);
+  gimp_language_store_parser_init ();
+
+  /*  initialize icon themes before gimp_widgets_init() so we avoid
+   *  setting the configured theme twice
+   */
+  icon_themes_init (gimp);
+
+  gimp_widgets_init (gui_help_func,
+                     gui_get_foreground_func,
+                     gui_get_background_func,
+                     NULL);
+
+  g_type_class_ref (GIMP_TYPE_COLOR_SELECT);
+
+  /*  disable automatic startup notification  */
+  gtk_window_set_auto_startup_notification (FALSE);
+
+#ifdef GDK_WINDOWING_QUARTZ
+  /* Before the first window is created (typically the splash window),
+   * we need to disable automatic tabbing behavior introduced on Sierra.
+   * This is known to cause all kinds of weird issues (see for instance
+   * Bugzilla #776294) and needs proper GTK+ support if we would want to
+   * enable it.
+   */
+  if ([NSWindow respondsToSelector:@selector(setAllowsAutomaticWindowTabbing:)])
+    [NSWindow setAllowsAutomaticWindowTabbing:NO];
+#endif /* GDK_WINDOWING_QUARTZ */
+
+  gimp_dnd_init (gimp);
+
+  themes_init (gimp);
+
+  initial_monitor = gimp_get_monitor_at_pointer (&initial_screen);
+  gtk_widget_set_default_colormap (gdk_screen_get_rgb_colormap (initial_screen));
+
+  if (! no_splash)
+    {
+      splash_create (gimp->be_verbose, initial_screen, initial_monitor);
+      status_callback = splash_update;
+    }
+
+  g_signal_connect_after (gimp, "initialize",
+                          G_CALLBACK (gui_initialize_after_callback),
+                          NULL);
+
+  g_signal_connect (gimp, "restore",
+                    G_CALLBACK (gui_restore_callback),
+                    NULL);
+  g_signal_connect_after (gimp, "restore",
+                          G_CALLBACK (gui_restore_after_callback),
+                          NULL);
+
+  g_signal_connect (gimp, "exit",
+                    G_CALLBACK (gui_exit_callback),
+                    NULL);
+  g_signal_connect_after (gimp, "exit",
+                          G_CALLBACK (gui_exit_after_callback),
+                          NULL);
+
+  return status_callback;
+}
+
+/*
+ * gui_recover:
+ * @n_recoveries: number of recovered files.
+ *
+ * Query the user interactively if files were saved from a previous
+ * crash, asking whether to try and recover or discard them.
+ *
+ * Returns: TRUE if answer is to try and recover, FALSE otherwise.
+ */
+gboolean
+gui_recover (gint n_recoveries)
+{
+  GtkWidget *dialog;
+  GtkWidget *box;
+  gboolean   recover;
+
+  dialog = gimp_dialog_new (_("Image Recovery"), "gimp-recovery",
+                            NULL, GTK_DIALOG_MODAL, NULL, NULL,
+                            _("_Discard"), GTK_RESPONSE_CANCEL,
+                            _("_Recover"), GTK_RESPONSE_OK,
+                            NULL);
+  gtk_dialog_set_default_response (GTK_DIALOG (dialog),
+                                   GTK_RESPONSE_OK);
+
+  box = gimp_message_box_new (GIMP_ICON_WILBER_EEK);
+  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
+                      box, TRUE, TRUE, 0);
+  gtk_widget_show (box);
+
+  gimp_message_box_set_primary_text (GIMP_MESSAGE_BOX (box),
+                                     _("Eeek! It looks like GIMP recovered from a crash!"));
+
+  gimp_message_box_set_text (GIMP_MESSAGE_BOX (box),
+                             /* TRANSLATORS: even if English singular form does
+                              * not use %d, you can use %d for translation in
+                              * any singular/plural form of your language if
+                              * suited. It will just work and be replaced by the
+                              * number of images as expected.
+                              */
+                             ngettext ("An image was salvaged from the crash. "
+                                       "Do you want to try and recover it?",
+                                       "%d images were salvaged from the crash. "
+                                       "Do you want to try and recover them?",
+                                       n_recoveries), n_recoveries);
+
+  recover = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+  gtk_widget_destroy (dialog);
+
+  return recover;
+}
+
+gint
+gui_get_initial_monitor (Gimp       *gimp,
+                         GdkScreen **screen)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), 0);
+  g_return_val_if_fail (screen != NULL, 0);
+
+  *screen = initial_screen;
+
+  return initial_monitor;
+}
+
+
+/*  private functions  */
+
+static gchar *
+gui_sanity_check (void)
+{
+#define GTK_REQUIRED_MAJOR 2
+#define GTK_REQUIRED_MINOR 24
+#define GTK_REQUIRED_MICRO 10
+
+  const gchar *mismatch = gtk_check_version (GTK_REQUIRED_MAJOR,
+                                             GTK_REQUIRED_MINOR,
+                                             GTK_REQUIRED_MICRO);
+
+  if (mismatch)
+    {
+      return g_strdup_printf
+        ("%s\n\n"
+         "GIMP requires GTK+ version %d.%d.%d or later.\n"
+         "Installed GTK+ version is %d.%d.%d.\n\n"
+         "Somehow you or your software packager managed\n"
+         "to install GIMP with an older GTK+ version.\n\n"
+         "Please upgrade to GTK+ version %d.%d.%d or later.",
+         mismatch,
+         GTK_REQUIRED_MAJOR, GTK_REQUIRED_MINOR, GTK_REQUIRED_MICRO,
+         gtk_major_version, gtk_minor_version, gtk_micro_version,
+         GTK_REQUIRED_MAJOR, GTK_REQUIRED_MINOR, GTK_REQUIRED_MICRO);
+    }
+
+#undef GTK_REQUIRED_MAJOR
+#undef GTK_REQUIRED_MINOR
+#undef GTK_REQUIRED_MICRO
+
+  return NULL;
+}
+
+static void
+gui_help_func (const gchar *help_id,
+               gpointer     help_data)
+{
+  g_return_if_fail (GIMP_IS_GIMP (the_gui_gimp));
+
+  gimp_help (the_gui_gimp, NULL, NULL, help_id);
+}
+
+static gboolean
+gui_get_foreground_func (GimpRGB *color)
+{
+  g_return_val_if_fail (color != NULL, FALSE);
+  g_return_val_if_fail (GIMP_IS_GIMP (the_gui_gimp), FALSE);
+
+  gimp_context_get_foreground (gimp_get_user_context (the_gui_gimp), color);
+
+  return TRUE;
+}
+
+static gboolean
+gui_get_background_func (GimpRGB *color)
+{
+  g_return_val_if_fail (color != NULL, FALSE);
+  g_return_val_if_fail (GIMP_IS_GIMP (the_gui_gimp), FALSE);
+
+  gimp_context_get_background (gimp_get_user_context (the_gui_gimp), color);
+
+  return TRUE;
+}
+
+static void
+gui_initialize_after_callback (Gimp               *gimp,
+                               GimpInitStatusFunc  status_callback)
+{
+  const gchar *name = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (gimp->be_verbose)
+    g_print ("INIT: %s\n", G_STRFUNC);
+
+#if defined (GDK_WINDOWING_X11)
+  name = "DISPLAY";
+#elif defined (GDK_WINDOWING_DIRECTFB) || defined (GDK_WINDOWING_FB)
+  name = "GDK_DISPLAY";
+#endif
+
+  /* TODO: Need to care about display migration with GTK+ 2.2 at some point */
+
+  if (name)
+    {
+      gchar *display = gdk_get_display ();
+
+      gimp_environ_table_add (gimp->plug_in_manager->environ_table,
+                              name, display, NULL);
+      g_free (display);
+    }
+
+  gimp_tools_init (gimp);
+
+  gimp_context_set_tool (gimp_get_user_context (gimp),
+                         gimp_tool_info_get_standard (gimp));
+}
+
+static void
+gui_restore_callback (Gimp               *gimp,
+                      GimpInitStatusFunc  status_callback)
+{
+  GimpDisplayConfig *display_config = GIMP_DISPLAY_CONFIG (gimp->config);
+  GimpGuiConfig     *gui_config     = GIMP_GUI_CONFIG (gimp->config);
+
+  if (gimp->be_verbose)
+    g_print ("INIT: %s\n", G_STRFUNC);
+
+  gui_vtable_init (gimp);
+
+  if (! gui_config->show_tooltips)
+    gimp_help_disable_tooltips ();
+
+  g_signal_connect (gui_config, "notify::show-tooltips",
+                    G_CALLBACK (gui_show_tooltips_notify),
+                    gimp);
+
+  gimp_dialogs_show_help_button (gui_config->use_help &&
+                                 gui_config->show_help_button);
+
+  g_signal_connect (gui_config, "notify::use-help",
+                    G_CALLBACK (gui_show_help_button_notify),
+                    gimp);
+  g_signal_connect (gui_config, "notify::user-manual-online",
+                    G_CALLBACK (gui_user_manual_notify),
+                    gimp);
+  g_signal_connect (gui_config, "notify::show-help-button",
+                    G_CALLBACK (gui_show_help_button_notify),
+                    gimp);
+
+  g_signal_connect (gimp_get_user_context (gimp), "display-changed",
+                    G_CALLBACK (gui_display_changed),
+                    gimp);
+
+  /* make sure the monitor resolution is valid */
+  if (display_config->monitor_res_from_gdk               ||
+      display_config->monitor_xres < GIMP_MIN_RESOLUTION ||
+      display_config->monitor_yres < GIMP_MIN_RESOLUTION)
+    {
+      gdouble xres, yres;
+
+      gimp_get_monitor_resolution (initial_screen,
+                                   initial_monitor,
+                                   &xres, &yres);
+
+      g_object_set (gimp->config,
+                    "monitor-xresolution",                      xres,
+                    "monitor-yresolution",                      yres,
+                    "monitor-resolution-from-windowing-system", TRUE,
+                    NULL);
+    }
+
+  actions_init (gimp);
+  menus_init (gimp, global_action_factory);
+  gimp_render_init (gimp);
+
+  dialogs_init (gimp, global_menu_factory);
+
+  gimp_clipboard_init (gimp);
+  if (gimp_get_clipboard_image (gimp))
+    gimp_clipboard_set_image (gimp, gimp_get_clipboard_image (gimp));
+  else
+    gimp_clipboard_set_buffer (gimp, gimp_get_clipboard_buffer (gimp));
+
+  g_signal_connect (gimp, "clipboard-changed",
+                    G_CALLBACK (gui_clipboard_changed),
+                    NULL);
+
+  gimp_devices_init (gimp);
+  gimp_controllers_init (gimp);
+  session_init (gimp);
+
+  g_type_class_unref (g_type_class_ref (GIMP_TYPE_COLOR_SELECTOR_PALETTE));
+
+  status_callback (NULL, _("Tool Options"), 1.0);
+  gimp_tools_restore (gimp);
+}
+
+#ifdef GDK_WINDOWING_QUARTZ
+static void
+gui_add_to_app_menu (GimpUIManager     *ui_manager,
+                     GtkosxApplication *osx_app,
+                     const gchar       *action_path,
+                     gint               index)
+{
+  GtkWidget *item;
+
+  item = gimp_ui_manager_get_widget (ui_manager, action_path);
+
+  if (GTK_IS_MENU_ITEM (item))
+    gtkosx_application_insert_app_menu_item (osx_app, GTK_WIDGET (item), index);
+}
+
+static gboolean
+gui_quartz_quit_callback (GtkosxApplication *osx_app,
+                          GimpUIManager     *ui_manager)
+{
+  gimp_ui_manager_activate_action (ui_manager, "file", "file-quit");
+
+  return TRUE;
+}
+#endif
+
+static void
+gui_restore_after_callback (Gimp               *gimp,
+                            GimpInitStatusFunc  status_callback)
+{
+  GimpGuiConfig *gui_config = GIMP_GUI_CONFIG (gimp->config);
+  GimpDisplay   *display;
+
+  if (gimp->be_verbose)
+    g_print ("INIT: %s\n", G_STRFUNC);
+
+  gimp->message_handler = GIMP_MESSAGE_BOX;
+
+  /*  load the recent documents after gimp_real_restore() because we
+   *  need the mime-types implemented by plug-ins
+   */
+  status_callback (NULL, _("Documents"), 0.9);
+  gimp_recent_list_load (gimp);
+
+  /*  enable this to always have icons everywhere  */
+  if (g_getenv ("GIMP_ICONS_LIKE_A_BOSS"))
+    {
+      GdkScreen *screen = gdk_screen_get_default ();
+
+      g_object_set (G_OBJECT (gtk_settings_get_for_screen (screen)),
+                    "gtk-button-images", TRUE,
+                    "gtk-menu-images",   TRUE,
+                    NULL);
+    }
+
+  if (gui_config->restore_accels)
+    menus_restore (gimp);
+
+  ui_configurer = g_object_new (GIMP_TYPE_UI_CONFIGURER,
+                                "gimp", gimp,
+                                NULL);
+
+  image_ui_manager = gimp_menu_factory_manager_new (global_menu_factory,
+                                                    "<Image>",
+                                                    gimp,
+                                                    gui_config->tearoff_menus);
+  gimp_ui_manager_update (image_ui_manager, gimp);
+
+  /* Check that every accelerator is unique. */
+  gtk_accel_map_foreach_unfiltered (NULL,
+                                    gui_check_unique_accelerator);
+
+  gimp_action_history_init (gimp);
+
+  g_signal_connect_object (gui_config, "notify::single-window-mode",
+                           G_CALLBACK (gui_single_window_mode_notify),
+                           ui_configurer, 0);
+  g_signal_connect_object (gui_config, "notify::tearoff-menus",
+                           G_CALLBACK (gui_tearoff_menus_notify),
+                           image_ui_manager, 0);
+  g_signal_connect (image_ui_manager, "show-tooltip",
+                    G_CALLBACK (gui_menu_show_tooltip),
+                    gimp);
+  g_signal_connect (image_ui_manager, "hide-tooltip",
+                    G_CALLBACK (gui_menu_hide_tooltip),
+                    gimp);
+
+  gimp_devices_restore (gimp);
+  gimp_controllers_restore (gimp, image_ui_manager);
+
+  if (status_callback == splash_update)
+    splash_destroy ();
+
+  if (gimp_get_show_gui (gimp))
+    {
+      GimpDisplayShell *shell;
+      GtkWidget        *toplevel;
+
+      /*  create the empty display  */
+      display = GIMP_DISPLAY (gimp_create_display (gimp, NULL,
+                                                   GIMP_UNIT_PIXEL, 1.0,
+                                                   G_OBJECT (initial_screen),
+                                                   initial_monitor));
+
+      shell = gimp_display_get_shell (display);
+
+      if (gui_config->restore_session)
+        session_restore (gimp,
+                         initial_screen,
+                         initial_monitor);
+
+      toplevel = gtk_widget_get_toplevel (GTK_WIDGET (shell));
+
+#ifdef GDK_WINDOWING_QUARTZ
+      {
+        GtkosxApplication *osx_app;
+        GtkWidget         *menu;
+        GtkWidget         *item;
+
+        [[NSUserDefaults standardUserDefaults] setObject:@"NO"
+                                                  forKey:@"NSTreatUnknownArgumentsAsOpen"];
+
+        osx_app = gtkosx_application_get ();
+
+        menu = gimp_ui_manager_get_widget (image_ui_manager,
+                                           "/image-menubar");
+        /* menu should have window parent for accelerator support */
+        gtk_widget_set_parent(menu, toplevel);
+
+        if (GTK_IS_MENU_ITEM (menu))
+          menu = gtk_menu_item_get_submenu (GTK_MENU_ITEM (menu));
+
+        /* do not activate OSX menu if tests are running */
+        if (! g_getenv ("GIMP_TESTING_ABS_TOP_SRCDIR"))
+          gtkosx_application_set_menu_bar (osx_app, GTK_MENU_SHELL (menu));
+
+        gtkosx_application_set_use_quartz_accelerators (osx_app, FALSE);
+
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             "/image-menubar/Help/dialogs-about", 0);
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             "/image-menubar/Help/dialogs-search-action", 1);
+
+#define PREFERENCES "/image-menubar/Edit/Preferences/"
+
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             PREFERENCES "dialogs-preferences", 3);
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             PREFERENCES "dialogs-input-devices", 4);
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             PREFERENCES "dialogs-keyboard-shortcuts", 5);
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             PREFERENCES "dialogs-module-dialog", 6);
+        gui_add_to_app_menu (image_ui_manager, osx_app,
+                             PREFERENCES "plug-in-unit-editor", 7);
+
+#undef PREFERENCES
+
+        item = gtk_separator_menu_item_new ();
+        gtkosx_application_insert_app_menu_item (osx_app, item, 8);
+
+        item = gimp_ui_manager_get_widget (image_ui_manager,
+                                           "/image-menubar/File/file-quit");
+        gtk_widget_hide (item);
+
+        g_signal_connect (osx_app, "NSApplicationBlockTermination",
+                          G_CALLBACK (gui_quartz_quit_callback),
+                          image_ui_manager);
+
+        gtkosx_application_ready (osx_app);
+      }
+#endif /* GDK_WINDOWING_QUARTZ */
+
+      /*  move keyboard focus to the display  */
+      gtk_window_present (GTK_WINDOW (toplevel));
+    }
+
+  /*  indicate that the application has finished loading  */
+  gdk_notify_startup_complete ();
+
+  /*  clear startup monitor variables  */
+  initial_screen  = NULL;
+  initial_monitor = -1;
+}
+
+static gboolean
+gui_exit_callback (Gimp     *gimp,
+                   gboolean  force)
+{
+  GimpGuiConfig *gui_config = GIMP_GUI_CONFIG (gimp->config);
+  GimpTool      *active_tool;
+
+  if (gimp->be_verbose)
+    g_print ("EXIT: %s\n", G_STRFUNC);
+
+  if (! force && gimp_displays_dirty (gimp))
+    {
+      GdkScreen *screen;
+      gint       monitor;
+
+      monitor = gimp_get_monitor_at_pointer (&screen);
+
+      gimp_dialog_factory_dialog_raise (gimp_dialog_factory_get_singleton (),
+                                        screen, monitor,
+                                        "gimp-quit-dialog", -1);
+
+      return TRUE; /* stop exit for now */
+    }
+
+  gimp->message_handler = GIMP_CONSOLE;
+
+  gui_unique_exit ();
+
+  /* If any modifier is set when quitting (typically when exiting with
+   * Ctrl-q for instance!), when serializing the tool options, it will
+   * save any alternate value instead of the main one. Make sure that
+   * any modifier is reset before saving options.
+   */
+  active_tool = tool_manager_get_active (gimp);
+  if  (active_tool && active_tool->focus_display)
+    gimp_tool_set_modifier_state  (active_tool, 0, active_tool->focus_display);
+
+  if (gui_config->save_session_info)
+    session_save (gimp, FALSE);
+
+  if (gui_config->save_device_status)
+    gimp_devices_save (gimp, FALSE);
+
+  if (TRUE /* gui_config->save_controllers */)
+    gimp_controllers_save (gimp);
+
+  g_signal_handlers_disconnect_by_func (gimp_get_user_context (gimp),
+                                        gui_display_changed,
+                                        gimp);
+
+  gimp_displays_delete (gimp);
+
+  if (gui_config->save_accels)
+    menus_save (gimp, FALSE);
+
+  gimp_tools_save (gimp, gui_config->save_tool_options, FALSE);
+  gimp_tools_exit (gimp);
+
+  gimp_language_store_parser_clean ();
+
+  return FALSE; /* continue exiting */
+}
+
+static gboolean
+gui_exit_after_callback (Gimp     *gimp,
+                         gboolean  force)
+{
+  if (gimp->be_verbose)
+    g_print ("EXIT: %s\n", G_STRFUNC);
+
+  g_signal_handlers_disconnect_by_func (gimp->config,
+                                        gui_show_help_button_notify,
+                                        gimp);
+  g_signal_handlers_disconnect_by_func (gimp->config,
+                                        gui_user_manual_notify,
+                                        gimp);
+  g_signal_handlers_disconnect_by_func (gimp->config,
+                                        gui_show_tooltips_notify,
+                                        gimp);
+
+  gimp_action_history_exit (gimp);
+
+  g_object_unref (image_ui_manager);
+  image_ui_manager = NULL;
+
+  g_object_unref (ui_configurer);
+  ui_configurer = NULL;
+
+  /*  exit the clipboard before shutting down the GUI because it runs
+   *  a whole lot of code paths. See bug #731389.
+   */
+  g_signal_handlers_disconnect_by_func (gimp,
+                                        G_CALLBACK (gui_clipboard_changed),
+                                        NULL);
+  gimp_clipboard_exit (gimp);
+
+  session_exit (gimp);
+  menus_exit (gimp);
+  actions_exit (gimp);
+  gimp_render_exit (gimp);
+
+  gimp_controllers_exit (gimp);
+  gimp_devices_exit (gimp);
+  dialogs_exit (gimp);
+  themes_exit (gimp);
+
+  g_type_class_unref (g_type_class_peek (GIMP_TYPE_COLOR_SELECT));
+
+  return FALSE; /* continue exiting */
+}
+
+static void
+gui_show_tooltips_notify (GimpGuiConfig *gui_config,
+                          GParamSpec    *param_spec,
+                          Gimp          *gimp)
+{
+  if (gui_config->show_tooltips)
+    gimp_help_enable_tooltips ();
+  else
+    gimp_help_disable_tooltips ();
+}
+
+static void
+gui_show_help_button_notify (GimpGuiConfig *gui_config,
+                             GParamSpec    *param_spec,
+                             Gimp          *gimp)
+{
+  gimp_dialogs_show_help_button (gui_config->use_help &&
+                                 gui_config->show_help_button);
+}
+
+static void
+gui_user_manual_notify (GimpGuiConfig *gui_config,
+                        GParamSpec    *param_spec,
+                        Gimp          *gimp)
+{
+  gimp_help_user_manual_changed (gimp);
+}
+
+static void
+gui_single_window_mode_notify (GimpGuiConfig      *gui_config,
+                               GParamSpec         *pspec,
+                               GimpUIConfigurer   *ui_configurer)
+{
+  gimp_ui_configurer_configure (ui_configurer,
+                                gui_config->single_window_mode);
+}
+static void
+gui_tearoff_menus_notify (GimpGuiConfig *gui_config,
+                          GParamSpec    *pspec,
+                          GtkUIManager  *manager)
+{
+  gtk_ui_manager_set_add_tearoffs (manager, gui_config->tearoff_menus);
+}
+
+static void
+gui_clipboard_changed (Gimp *gimp)
+{
+  if (gimp_get_clipboard_image (gimp))
+    gimp_clipboard_set_image (gimp, gimp_get_clipboard_image (gimp));
+  else
+    gimp_clipboard_set_buffer (gimp, gimp_get_clipboard_buffer (gimp));
+}
+
+static void
+gui_menu_show_tooltip (GimpUIManager *manager,
+                       const gchar   *tooltip,
+                       Gimp          *gimp)
+{
+  GimpContext *context = gimp_get_user_context (gimp);
+  GimpDisplay *display = gimp_context_get_display (context);
+
+  if (display)
+    {
+      GimpDisplayShell *shell     = gimp_display_get_shell (display);
+      GimpStatusbar    *statusbar = gimp_display_shell_get_statusbar (shell);
+
+      gimp_statusbar_push (statusbar, "menu-tooltip",
+                           NULL, "%s", tooltip);
+    }
+}
+
+static void
+gui_menu_hide_tooltip (GimpUIManager *manager,
+                       Gimp          *gimp)
+{
+  GimpContext *context = gimp_get_user_context (gimp);
+  GimpDisplay *display = gimp_context_get_display (context);
+
+  if (display)
+    {
+      GimpDisplayShell *shell     = gimp_display_get_shell (display);
+      GimpStatusbar    *statusbar = gimp_display_shell_get_statusbar (shell);
+
+      gimp_statusbar_pop (statusbar, "menu-tooltip");
+    }
+}
+
+static void
+gui_display_changed (GimpContext *context,
+                     GimpDisplay *display,
+                     Gimp        *gimp)
+{
+  if (! display)
+    {
+      GimpImage *image = gimp_context_get_image (context);
+
+      if (image)
+        {
+          GList *list;
+
+          for (list = gimp_get_display_iter (gimp);
+               list;
+               list = g_list_next (list))
+            {
+              GimpDisplay *display2 = list->data;
+
+              if (gimp_display_get_image (display2) == image)
+                {
+                  gimp_context_set_display (context, display2);
+
+                  /* stop the emission of the original signal
+                   * (the emission of the recursive signal is finished)
+                   */
+                  g_signal_stop_emission_by_name (context, "display-changed");
+                  return;
+                }
+            }
+
+          gimp_context_set_image (context, NULL);
+        }
+    }
+
+  gimp_ui_manager_update (image_ui_manager, display);
+}
+
+typedef struct
+{
+  const gchar     *path;
+  guint            key;
+  GdkModifierType  mods;
+}
+accelData;
+
+static void
+gui_compare_accelerator (gpointer         data,
+                         const gchar     *accel_path,
+                         guint            accel_key,
+                         GdkModifierType  accel_mods,
+                         gboolean         changed)
+{
+  accelData *accel = data;
+
+  if (accel->key == accel_key && accel->mods == accel_mods &&
+      g_strcmp0 (accel->path, accel_path))
+    {
+      g_printerr ("Actions \"%s\" and \"%s\" use the same accelerator.\n"
+                  "  Disabling the accelerator on \"%s\".\n",
+                  accel->path, accel_path, accel_path);
+      gtk_accel_map_change_entry (accel_path, 0, 0, FALSE);
+    }
+}
+
+static void
+gui_check_unique_accelerator (gpointer         data,
+                              const gchar     *accel_path,
+                              guint            accel_key,
+                              GdkModifierType  accel_mods,
+                              gboolean         changed)
+{
+  if (gtk_accelerator_valid (accel_key, accel_mods) &&
+      gui_check_action_exists (accel_path))
+    {
+      accelData accel;
+
+      accel.path = accel_path;
+      accel.key  = accel_key;
+      accel.mods = accel_mods;
+
+      gtk_accel_map_foreach_unfiltered (&accel,
+                                        gui_compare_accelerator);
+    }
+}
+
+static gboolean
+gui_check_action_exists (const gchar *accel_path)
+{
+  GimpUIManager *manager;
+  gboolean       action_exists = FALSE;
+  GList         *list;
+
+  manager = gimp_ui_managers_from_name ("<Image>")->data;
+
+  for (list = gimp_ui_manager_get_action_groups (manager);
+       list;
+       list = g_list_next (list))
+    {
+      GimpActionGroup *group   = list->data;
+      GList           *actions = NULL;
+      GList           *list2;
+
+      actions = gimp_action_group_list_actions (group);
+
+      for (list2 = actions; list2; list2 = g_list_next (list2))
+        {
+          GimpAction  *action = list2->data;
+          const gchar *path   = gimp_action_get_accel_path (action);
+
+          if (g_strcmp0 (path, accel_path) == 0)
+            {
+              action_exists = TRUE;
+              break;
+            }
+        }
+
+      g_list_free (actions);
+
+      if (action_exists)
+        break;
+    }
+
+  return action_exists;
+}
diff --git a/app/gui/gui.h b/app/gui/gui.h
new file mode 100644
index 0000000..4b0435d
--- /dev/null
+++ b/app/gui/gui.h
@@ -0,0 +1,30 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_H__
+#define __GUI_H__
+
+
+void               gui_libs_init (GOptionContext *context);
+void               gui_abort     (const gchar    *abort_message);
+
+GimpInitStatusFunc gui_init      (Gimp           *gimp,
+                                  gboolean        no_splash);
+
+gboolean           gui_recover   (gint            n_recoveries);
+
+#endif /* __GUI_H__ */
diff --git a/app/gui/icon-themes.c b/app/gui/icon-themes.c
new file mode 100644
index 0000000..27c39eb
--- /dev/null
+++ b/app/gui/icon-themes.c
@@ -0,0 +1,250 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * icon-themes.c
+ * Copyright (C) 2015 Benoit Touchette
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gui-types.h"
+
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+
+#include "icon-themes.h"
+
+#include "gimp-intl.h"
+
+
+static void   icons_apply_theme         (Gimp          *gimp,
+                                         const gchar   *icon_theme_name);
+static void   icons_list_icons_foreach  (gpointer       key,
+                                         gpointer       value,
+                                         gpointer       data);
+static gint   icons_name_compare        (const void    *p1,
+                                         const void    *p2);
+static void   icons_theme_change_notify (GimpGuiConfig *config,
+                                         GParamSpec    *pspec,
+                                         Gimp          *gimp);
+
+
+static GHashTable *icon_themes_hash = NULL;
+
+
+void
+icon_themes_init (Gimp *gimp)
+{
+  GimpGuiConfig *config;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  config = GIMP_GUI_CONFIG (gimp->config);
+
+  icon_themes_hash = g_hash_table_new_full (g_str_hash,
+                                            g_str_equal,
+                                            g_free,
+                                            g_object_unref);
+
+  if (config->icon_theme_path)
+    {
+      GList *path;
+      GList *list;
+
+      path = gimp_config_path_expand_to_files (config->icon_theme_path, NULL);
+
+      for (list = path; list; list = g_list_next (list))
+        {
+          GFile           *dir = list->data;
+          GFileEnumerator *enumerator;
+
+          enumerator =
+            g_file_enumerate_children (dir,
+                                       G_FILE_ATTRIBUTE_STANDARD_NAME ","
+                                       G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
+                                       G_FILE_ATTRIBUTE_STANDARD_TYPE,
+                                       G_FILE_QUERY_INFO_NONE,
+                                       NULL, NULL);
+
+          if (enumerator)
+            {
+              GFileInfo *info;
+
+              while ((info = g_file_enumerator_next_file (enumerator,
+                                                          NULL, NULL)))
+                {
+                  if (! g_file_info_get_is_hidden (info) &&
+                      g_file_info_get_file_type (info) == G_FILE_TYPE_DIRECTORY)
+                    {
+                      GFile *file;
+                      GFile *index_theme;
+
+                      file = g_file_enumerator_get_child (enumerator, info);
+
+                      /* make sure there is a hicolor/index.theme file */
+                      index_theme = g_file_get_child (file, "index.theme");
+
+                      if (g_file_query_exists (index_theme, NULL))
+                        {
+                          const gchar *name;
+                          gchar       *basename;
+
+                          name     = gimp_file_get_utf8_name (file);
+                          basename = g_path_get_basename (name);
+
+                          if (strcmp ("hicolor", basename))
+                            {
+                              if (gimp->be_verbose)
+                                g_print ("Adding icon theme '%s' (%s)\n",
+                                         basename, name);
+
+                              g_hash_table_insert (icon_themes_hash, basename,
+                                                   g_object_ref (file));
+                            }
+                          else
+                            {
+                              g_free (basename);
+                            }
+                        }
+
+                      g_object_unref (index_theme);
+                      g_object_unref (file);
+                    }
+
+                  g_object_unref (info);
+                }
+
+              g_object_unref (enumerator);
+            }
+        }
+
+      g_list_free_full (path, (GDestroyNotify) g_object_unref);
+    }
+
+  g_signal_connect (config, "notify::icon-theme",
+                    G_CALLBACK (icons_theme_change_notify),
+                    gimp);
+
+  icons_theme_change_notify (config, NULL, gimp);
+}
+
+void
+icon_themes_exit (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (icon_themes_hash)
+    {
+      g_signal_handlers_disconnect_by_func (gimp->config,
+                                            icons_theme_change_notify,
+                                            gimp);
+
+      g_hash_table_destroy (icon_themes_hash);
+      icon_themes_hash = NULL;
+    }
+}
+
+gchar **
+icon_themes_list_themes (Gimp *gimp,
+                         gint *n_icon_themes)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (n_icon_themes != NULL, NULL);
+
+  *n_icon_themes = g_hash_table_size (icon_themes_hash);
+
+  if (*n_icon_themes > 0)
+    {
+      gchar **icon_themes;
+      gchar **index;
+
+      icon_themes = g_new0 (gchar *, *n_icon_themes + 1);
+
+      index = icon_themes;
+
+      g_hash_table_foreach (icon_themes_hash, icons_list_icons_foreach, &index);
+
+      qsort (icon_themes, *n_icon_themes, sizeof (gchar *), icons_name_compare);
+
+      return icon_themes;
+    }
+
+  return NULL;
+}
+
+GFile *
+icon_themes_get_theme_dir (Gimp        *gimp,
+                           const gchar *icon_theme_name)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+
+  if (! icon_theme_name)
+    icon_theme_name = GIMP_CONFIG_DEFAULT_ICON_THEME;
+
+  return g_hash_table_lookup (icon_themes_hash, icon_theme_name);
+}
+
+static void
+icons_apply_theme (Gimp        *gimp,
+                   const gchar *icon_theme_name)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (! icon_theme_name)
+    icon_theme_name = GIMP_CONFIG_DEFAULT_ICON_THEME;
+
+  if (gimp->be_verbose)
+    g_print ("Loading icon theme '%s'\n", icon_theme_name);
+
+  gimp_icons_set_icon_theme (icon_themes_get_theme_dir (gimp, icon_theme_name));
+}
+
+static void
+icons_list_icons_foreach (gpointer key,
+                          gpointer value,
+                          gpointer data)
+{
+  gchar ***index = data;
+
+  **index = g_strdup ((gchar *) key);
+
+  (*index)++;
+}
+
+static gint
+icons_name_compare (const void *p1,
+                    const void *p2)
+{
+  return strcmp (* (char **) p1, * (char **) p2);
+}
+
+static void
+icons_theme_change_notify (GimpGuiConfig *config,
+                           GParamSpec    *pspec,
+                           Gimp          *gimp)
+{
+  icons_apply_theme (gimp, config->icon_theme);
+}
diff --git a/app/gui/icon-themes.h b/app/gui/icon-themes.h
new file mode 100644
index 0000000..14ecef9
--- /dev/null
+++ b/app/gui/icon-themes.h
@@ -0,0 +1,34 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * icon-themes.h
+ * Copyright (C) 2015 Benoit Touchette
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ICONS_THEMES_H__
+#define __ICONS_THEMES_H__
+
+
+void     icon_themes_init          (Gimp        *gimp);
+void     icon_themes_exit          (Gimp        *gimp);
+
+gchar ** icon_themes_list_themes   (Gimp        *gimp,
+                                    gint        *n_themes);
+GFile  * icon_themes_get_theme_dir (Gimp        *gimp,
+                                    const gchar *theme_name);
+
+
+#endif /* __ICONS_THEMES_H__ */
diff --git a/app/gui/session.c b/app/gui/session.c
new file mode 100644
index 0000000..cfbc1c8
--- /dev/null
+++ b/app/gui/session.c
@@ -0,0 +1,486 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Session-managment stuff
+ * Copyright (C) 1998 Sven Neumann <sven@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "gui-types.h"
+
+#include "config/gimpconfig-file.h"
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimperror.h"
+
+#include "widgets/gimpdialogfactory.h"
+#include "widgets/gimpsessioninfo.h"
+#include "widgets/gimpwidgets-utils.h"
+
+#include "dialogs/dialogs.h"
+
+#include "session.h"
+#include "gimp-log.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  SESSION_INFO = 1,
+  HIDE_DOCKS,
+  SINGLE_WINDOW_MODE,
+  SHOW_TABS,
+  TABS_POSITION,
+  LAST_TIP_SHOWN
+};
+
+
+static GFile * session_file (Gimp *gimp);
+
+
+/*  private variables  */
+
+static gboolean   sessionrc_deleted = FALSE;
+
+
+/*  public functions  */
+
+void
+session_init (Gimp *gimp)
+{
+  GFile      *file;
+  GScanner   *scanner;
+  GTokenType  token;
+  GError     *error = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  file = session_file (gimp);
+
+  scanner = gimp_scanner_new_gfile (file, &error);
+
+  if (! scanner && error->code == GIMP_CONFIG_ERROR_OPEN_ENOENT)
+    {
+      g_clear_error (&error);
+      g_object_unref (file);
+
+      file = gimp_sysconf_directory_file ("sessionrc", NULL);
+
+      scanner = gimp_scanner_new_gfile (file, NULL);
+    }
+
+  if (! scanner)
+    {
+      g_clear_error (&error);
+      g_object_unref (file);
+      return;
+    }
+
+  if (gimp->be_verbose)
+    g_print ("Parsing '%s'\n", gimp_file_get_utf8_name (file));
+
+  g_scanner_scope_add_symbol (scanner, 0, "session-info",
+                              GINT_TO_POINTER (SESSION_INFO));
+  g_scanner_scope_add_symbol (scanner, 0,  "hide-docks",
+                              GINT_TO_POINTER (HIDE_DOCKS));
+  g_scanner_scope_add_symbol (scanner, 0,  "single-window-mode",
+                              GINT_TO_POINTER (SINGLE_WINDOW_MODE));
+  g_scanner_scope_add_symbol (scanner, 0,  "show-tabs",
+                              GINT_TO_POINTER (SHOW_TABS));
+  g_scanner_scope_add_symbol (scanner, 0,  "tabs-position",
+                              GINT_TO_POINTER (TABS_POSITION));
+  g_scanner_scope_add_symbol (scanner, 0,  "last-tip-shown",
+                              GINT_TO_POINTER (LAST_TIP_SHOWN));
+
+  token = G_TOKEN_LEFT_PAREN;
+
+  while (g_scanner_peek_next_token (scanner) == token)
+    {
+      token = g_scanner_get_next_token (scanner);
+
+      switch (token)
+        {
+        case G_TOKEN_LEFT_PAREN:
+          token = G_TOKEN_SYMBOL;
+          break;
+
+        case G_TOKEN_SYMBOL:
+          if (scanner->value.v_symbol == GINT_TO_POINTER (SESSION_INFO))
+            {
+              GimpDialogFactory      *factory      = NULL;
+              GimpSessionInfo        *info         = NULL;
+              gchar                  *factory_name = NULL;
+              gchar                  *entry_name   = NULL;
+              GimpDialogFactoryEntry *entry        = NULL;
+
+              token = G_TOKEN_STRING;
+
+              if (! gimp_scanner_parse_string (scanner, &factory_name))
+                break;
+
+              /* In versions <= GIMP 2.6 there was a "toolbox", a
+               * "dock", a "display" and a "toplevel" factory. These
+               * are now merged to a single gimp_dialog_factory_get_singleton (). We
+               * need the legacy name though, so keep it around.
+               */
+              factory = gimp_dialog_factory_get_singleton ();
+
+              info = gimp_session_info_new ();
+
+              /* GIMP 2.6 has the entry name as part of the
+               * session-info header, so try to get it
+               */
+              gimp_scanner_parse_string (scanner, &entry_name);
+              if (entry_name)
+                {
+                  /* Previously, GimpDock was a toplevel. That is why
+                   * versions <= GIMP 2.6 has "dock" as the entry name. We
+                   * want "dock" to be interpreted as 'dock window'
+                   * however so have some special-casing for that. When
+                   * the entry name is "dock" the factory name is either
+                   * "dock" or "toolbox".
+                   */
+                  if (strcmp (entry_name, "dock") == 0)
+                    {
+                      entry =
+                        gimp_dialog_factory_find_entry (factory,
+                                                        (strcmp (factory_name, "toolbox") == 0 ?
+                                                         "gimp-toolbox-window" :
+                                                         "gimp-dock-window"));
+                    }
+                  else
+                    {
+                      entry = gimp_dialog_factory_find_entry (factory,
+                                                              entry_name);
+                    }
+                }
+
+              /* We're done with these now */
+              g_free (factory_name);
+              g_free (entry_name);
+
+              /* We can get the factory entry either now (the GIMP <=
+               * 2.6 way), or when we deserialize (the GIMP 2.8 way)
+               */
+              if (entry)
+                {
+                  gimp_session_info_set_factory_entry (info, entry);
+                }
+
+              /* Always try to deserialize */
+              if (gimp_config_deserialize (GIMP_CONFIG (info), scanner, 1, NULL))
+                {
+                  /* Make sure we got a factory entry either the 2.6
+                   * or 2.8 way
+                   */
+                  if (gimp_session_info_get_factory_entry (info))
+                    {
+                      GIMP_LOG (DIALOG_FACTORY,
+                                "successfully parsed and added session info %p",
+                                info);
+
+                      gimp_dialog_factory_add_session_info (factory, info);
+                    }
+                  else
+                    {
+                      GIMP_LOG (DIALOG_FACTORY,
+                                "failed to parse session info %p, not adding",
+                                info);
+                    }
+
+                  g_object_unref (info);
+                }
+              else
+                {
+                  g_object_unref (info);
+
+                  /* set token to left paren to we won't set another
+                   * error below, gimp_config_deserialize() already did
+                   */
+                  token = G_TOKEN_LEFT_PAREN;
+                  goto error;
+                }
+            }
+          else if (scanner->value.v_symbol == GINT_TO_POINTER (HIDE_DOCKS))
+            {
+              gboolean hide_docks;
+
+              token = G_TOKEN_IDENTIFIER;
+
+              if (! gimp_scanner_parse_boolean (scanner, &hide_docks))
+                break;
+
+              g_object_set (gimp->config,
+                            "hide-docks", hide_docks,
+                            NULL);
+            }
+          else if (scanner->value.v_symbol == GINT_TO_POINTER (SINGLE_WINDOW_MODE))
+            {
+              gboolean single_window_mode;
+
+              token = G_TOKEN_IDENTIFIER;
+
+              if (! gimp_scanner_parse_boolean (scanner, &single_window_mode))
+                break;
+
+              g_object_set (gimp->config,
+                            "single-window-mode", single_window_mode,
+                            NULL);
+            }
+          else if (scanner->value.v_symbol == GINT_TO_POINTER (SHOW_TABS))
+          {
+            gboolean show_tabs;
+
+            token = G_TOKEN_IDENTIFIER;
+
+            if (! gimp_scanner_parse_boolean (scanner, &show_tabs))
+              break;
+
+            g_object_set (gimp->config,
+                          "show-tabs", show_tabs,
+                          NULL);
+          }
+          else if (scanner->value.v_symbol == GINT_TO_POINTER (TABS_POSITION))
+            {
+              gint tabs_position;
+
+              token = G_TOKEN_INT;
+
+              if (! gimp_scanner_parse_int (scanner, &tabs_position))
+                break;
+
+              g_object_set (gimp->config,
+                            "tabs-position", tabs_position,
+                            NULL);
+            }
+          else if (scanner->value.v_symbol == GINT_TO_POINTER (LAST_TIP_SHOWN))
+            {
+              gint last_tip_shown;
+
+              token = G_TOKEN_INT;
+
+              if (! gimp_scanner_parse_int (scanner, &last_tip_shown))
+                break;
+
+              g_object_set (gimp->config,
+                            "last-tip-shown", last_tip_shown,
+                            NULL);
+            }
+          token = G_TOKEN_RIGHT_PAREN;
+          break;
+
+        case G_TOKEN_RIGHT_PAREN:
+          token = G_TOKEN_LEFT_PAREN;
+          break;
+
+        default: /* do nothing */
+          break;
+        }
+    }
+
+ error:
+
+  if (token != G_TOKEN_LEFT_PAREN)
+    {
+      g_scanner_get_next_token (scanner);
+      g_scanner_unexp_token (scanner, token, NULL, NULL, NULL,
+                             _("fatal parse error"), TRUE);
+    }
+
+  if (error)
+    {
+      gimp_message_literal (gimp, NULL, GIMP_MESSAGE_ERROR, error->message);
+      g_clear_error (&error);
+
+      gimp_config_file_backup_on_error (file, "sessionrc", NULL);
+    }
+
+  gimp_scanner_destroy (scanner);
+  g_object_unref (file);
+
+  dialogs_load_recent_docks (gimp);
+}
+
+void
+session_exit (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+}
+
+void
+session_restore (Gimp      *gimp,
+                 GdkScreen *screen,
+                 gint       monitor)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (GDK_IS_SCREEN (screen));
+
+  gimp_dialog_factory_restore (gimp_dialog_factory_get_singleton (),
+                               screen, monitor);
+
+  /* make sure GimpImageWindow acts upon hide-docks at the right time,
+   * see bug #678043.
+   */
+  if (GIMP_GUI_CONFIG (gimp->config)->single_window_mode &&
+      GIMP_GUI_CONFIG (gimp->config)->hide_docks)
+    {
+      g_object_notify (G_OBJECT (gimp->config), "hide-docks");
+    }
+}
+
+void
+session_save (Gimp     *gimp,
+              gboolean  always_save)
+{
+  GimpConfigWriter *writer;
+  GFile            *file;
+  GError           *error = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (sessionrc_deleted && ! always_save)
+    return;
+
+  file = session_file (gimp);
+
+  if (gimp->be_verbose)
+    g_print ("Writing '%s'\n", gimp_file_get_utf8_name (file));
+
+  writer =
+    gimp_config_writer_new_gfile (file,
+                                  TRUE,
+                                  "GIMP sessionrc\n\n"
+                                  "This file takes session-specific info "
+                                  "(that is info, you want to keep between "
+                                  "two GIMP sessions).  You are not supposed "
+                                  "to edit it manually, but of course you "
+                                  "can do.  The sessionrc will be entirely "
+                                  "rewritten every time you quit GIMP.  "
+                                  "If this file isn't found, defaults are "
+                                  "used.",
+                                  NULL);
+  g_object_unref (file);
+
+  if (!writer)
+    return;
+
+  gimp_dialog_factory_save (gimp_dialog_factory_get_singleton (), writer);
+  gimp_config_writer_linefeed (writer);
+
+  gimp_config_writer_open (writer, "hide-docks");
+  gimp_config_writer_identifier (writer,
+                                 GIMP_GUI_CONFIG (gimp->config)->hide_docks ?
+                                 "yes" : "no");
+  gimp_config_writer_close (writer);
+
+  gimp_config_writer_open (writer, "single-window-mode");
+  gimp_config_writer_identifier (writer,
+                                 GIMP_GUI_CONFIG (gimp->config)->single_window_mode ?
+                                 "yes" : "no");
+  gimp_config_writer_close (writer);
+
+  gimp_config_writer_open (writer, "show-tabs");
+  gimp_config_writer_printf (writer,
+                             GIMP_GUI_CONFIG (gimp->config)->show_tabs ?
+                             "yes" : "no");
+  gimp_config_writer_close (writer);
+
+  gimp_config_writer_open (writer, "tabs-position");
+  gimp_config_writer_printf (writer, "%d",
+                             GIMP_GUI_CONFIG (gimp->config)->tabs_position);
+  gimp_config_writer_close (writer);
+
+  gimp_config_writer_open (writer, "last-tip-shown");
+  gimp_config_writer_printf (writer, "%d",
+                             GIMP_GUI_CONFIG (gimp->config)->last_tip_shown);
+  gimp_config_writer_close (writer);
+
+  if (! gimp_config_writer_finish (writer, "end of sessionrc", &error))
+    {
+      gimp_message_literal (gimp, NULL, GIMP_MESSAGE_ERROR, error->message);
+      g_clear_error (&error);
+    }
+
+  dialogs_save_recent_docks (gimp);
+
+  sessionrc_deleted = FALSE;
+}
+
+gboolean
+session_clear (Gimp    *gimp,
+               GError **error)
+{
+  GFile    *file;
+  GError   *my_error = NULL;
+  gboolean  success  = TRUE;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  file = session_file (gimp);
+
+  if (! g_file_delete (file, NULL, &my_error) &&
+      my_error->code != G_IO_ERROR_NOT_FOUND)
+    {
+      success = FALSE;
+
+      g_set_error (error, GIMP_ERROR, GIMP_FAILED,
+                   _("Deleting \"%s\" failed: %s"),
+                   gimp_file_get_utf8_name (file), my_error->message);
+    }
+  else
+    {
+      sessionrc_deleted = TRUE;
+    }
+
+  g_clear_error (&my_error);
+  g_object_unref (file);
+
+  return success;
+}
+
+
+static GFile *
+session_file (Gimp *gimp)
+{
+  const gchar *basename;
+  gchar       *filename;
+  GFile       *file;
+
+  basename = g_getenv ("GIMP_TESTING_SESSIONRC_NAME");
+  if (! basename)
+    basename = "sessionrc";
+
+  if (gimp->session_name)
+    filename = g_strconcat (basename, ".", gimp->session_name, NULL);
+  else
+    filename = g_strdup (basename);
+
+  file = gimp_directory_file (filename, NULL);
+
+  g_free (filename);
+
+  return file;
+}
diff --git a/app/gui/session.h b/app/gui/session.h
new file mode 100644
index 0000000..aff1145
--- /dev/null
+++ b/app/gui/session.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SESSION_H__
+#define __SESSION_H__
+
+
+void       session_init    (Gimp      *gimp);
+void       session_exit    (Gimp      *gimp);
+
+void       session_restore (Gimp      *gimp,
+                            GdkScreen *screen,
+                            gint       monitor);
+void       session_save    (Gimp      *gimp,
+                            gboolean   always_save);
+
+gboolean   session_clear   (Gimp      *gimp,
+                            GError   **error);
+
+
+#endif  /*  __SESSION_H__  */
diff --git a/app/gui/splash.c b/app/gui/splash.c
new file mode 100644
index 0000000..1499af7
--- /dev/null
+++ b/app/gui/splash.c
@@ -0,0 +1,728 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gui-types.h"
+
+#include "widgets/gimpwidgets-utils.h"
+
+#include "splash.h"
+
+#include "gimp-intl.h"
+
+
+#define MEASURE_UPPER "1235678901234567890"
+#define MEASURE_LOWER "12356789012345678901234567890"
+
+
+typedef struct
+{
+  GtkWidget      *window;
+  GtkWidget      *area;
+  gint            width;
+  gint            height;
+  GtkWidget      *progress;
+  GdkColor        color;
+  PangoLayout    *upper;
+  gint            upper_x;
+  gint            upper_y;
+  PangoLayout    *lower;
+  gint            lower_x;
+  gint            lower_y;
+
+  gdouble         percentage;
+  gchar          *text1;
+  gchar          *text2;
+
+  /* debug timer */
+  GTimer         *timer;
+  gdouble         last_time;
+} GimpSplash;
+
+static GimpSplash *splash = NULL;
+
+
+static void        splash_position_layouts     (GimpSplash     *splash,
+                                                const gchar    *text1,
+                                                const gchar    *text2,
+                                                GdkRectangle   *area);
+static gboolean    splash_area_expose          (GtkWidget      *widget,
+                                                GdkEventExpose *event,
+                                                GimpSplash     *splash);
+static void        splash_rectangle_union      (GdkRectangle   *dest,
+                                                PangoRectangle *pango_rect,
+                                                gint            offset_x,
+                                                gint            offset_y);
+static gboolean    splash_average_text_area    (GimpSplash     *splash,
+                                                GdkPixbuf      *pixbuf,
+                                                GdkColor       *color);
+
+static GdkPixbufAnimation *
+                   splash_image_load           (gint            max_width,
+                                                gint            max_height,
+                                                gboolean        be_verbose);
+static GdkPixbufAnimation *
+                   splash_image_load_from_path (const gchar    *filename,
+                                                gint            max_width,
+                                                gint            max_height,
+                                                gboolean        be_verbose);
+static GdkPixbufAnimation *
+                   splash_image_load_from_file (GFile    *file,
+                                                gint      max_width,
+                                                gint      max_height,
+                                                gboolean  be_verbose);
+static GdkPixbufAnimation *
+                   splash_image_pick_from_dirs (GList          *dirs,
+                                                gint            max_width,
+                                                gint            max_height,
+                                                gboolean        be_verbose);
+
+static void        splash_timer_elapsed        (void);
+
+
+/*  public functions  */
+
+void
+splash_create (gboolean   be_verbose,
+               GdkScreen *screen,
+               gint       monitor)
+{
+  GtkWidget          *frame;
+  GtkWidget          *vbox;
+  GdkPixbufAnimation *pixbuf;
+  PangoRectangle      ink;
+  gint                max_width;
+  gint                max_height;
+
+  g_return_if_fail (splash == NULL);
+  g_return_if_fail (GDK_IS_SCREEN (screen));
+
+  max_width  = gdk_screen_get_width (screen) / 2;
+  max_height = gdk_screen_get_height (screen) / 2;
+  pixbuf = splash_image_load (max_width, max_height, be_verbose);
+
+  if (! pixbuf)
+    return;
+
+  splash = g_slice_new0 (GimpSplash);
+
+  splash->window =
+    g_object_new (GTK_TYPE_WINDOW,
+                  "type",            GTK_WINDOW_TOPLEVEL,
+                  "type-hint",       GDK_WINDOW_TYPE_HINT_SPLASHSCREEN,
+                  "title",           _("GIMP Startup"),
+                  "role",            "gimp-startup",
+                  "screen",          screen,
+                  "window-position", GTK_WIN_POS_CENTER,
+                  "resizable",       FALSE,
+                  NULL);
+
+  g_signal_connect_swapped (splash->window, "delete-event",
+                            G_CALLBACK (exit),
+                            GINT_TO_POINTER (0));
+
+  splash->width  = MIN (gdk_pixbuf_animation_get_width (pixbuf),
+                        gdk_screen_get_width (screen));
+  splash->height = MIN (gdk_pixbuf_animation_get_height (pixbuf),
+                        gdk_screen_get_height (screen));
+
+  frame = gtk_frame_new (NULL);
+  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
+  gtk_container_add (GTK_CONTAINER (splash->window), frame);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  splash->area = gtk_image_new_from_animation (pixbuf);
+  gtk_box_pack_start (GTK_BOX (vbox), splash->area, TRUE, TRUE, 0);
+  gtk_widget_show (splash->area);
+
+  gtk_widget_set_size_request (splash->area, splash->width, splash->height);
+
+  /*  create the pango layouts  */
+  splash->upper = gtk_widget_create_pango_layout (splash->area,
+                                                  MEASURE_UPPER);
+  pango_layout_get_pixel_extents (splash->upper, &ink, NULL);
+
+  if (splash->width > 4 * ink.width)
+    gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_X_LARGE);
+  else if (splash->width > 3 * ink.width)
+    gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_LARGE);
+  else if (splash->width > 2 * ink.width)
+    gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_MEDIUM);
+  else
+    gimp_pango_layout_set_scale (splash->upper, PANGO_SCALE_MEDIUM);
+
+  splash->lower = gtk_widget_create_pango_layout (splash->area,
+                                                  MEASURE_LOWER);
+  pango_layout_get_pixel_extents (splash->lower, &ink, NULL);
+
+  if (splash->width > 4 * ink.width)
+    gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_LARGE);
+  else if (splash->width > 3 * ink.width)
+    gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_MEDIUM);
+  else if (splash->width > 2 * ink.width)
+    gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_SMALL);
+  else
+    gimp_pango_layout_set_scale (splash->lower, PANGO_SCALE_X_SMALL);
+
+  /*  this sets the initial layout positions  */
+  splash_position_layouts (splash, "", "", NULL);
+
+  splash_average_text_area (splash,
+                            gdk_pixbuf_animation_get_static_image (pixbuf),
+                            &splash->color);
+
+  g_object_unref (pixbuf);
+
+  g_signal_connect_after (splash->area, "expose-event",
+                          G_CALLBACK (splash_area_expose),
+                          splash);
+
+  /*  add a progress bar  */
+  splash->progress = gtk_progress_bar_new ();
+  gtk_box_pack_end (GTK_BOX (vbox), splash->progress, FALSE, FALSE, 0);
+  gtk_widget_show (splash->progress);
+
+  gtk_widget_show (splash->window);
+
+  if (FALSE)
+    splash->timer = g_timer_new ();
+}
+
+void
+splash_destroy (void)
+{
+  if (! splash)
+    return;
+
+  gtk_widget_destroy (splash->window);
+
+  g_object_unref (splash->upper);
+  g_object_unref (splash->lower);
+
+  g_free (splash->text1);
+  g_free (splash->text2);
+
+  if (splash->timer)
+    g_timer_destroy (splash->timer);
+
+  g_slice_free (GimpSplash, splash);
+  splash = NULL;
+}
+
+void
+splash_update (const gchar *text1,
+               const gchar *text2,
+               gdouble      percentage)
+{
+  GdkRectangle expose = { 0, 0, 0, 0 };
+
+  g_return_if_fail (percentage >= 0.0 && percentage <= 1.0);
+
+  if (! splash)
+    return;
+
+  splash_position_layouts (splash, text1, text2, &expose);
+
+  if (expose.width > 0 && expose.height > 0)
+    gtk_widget_queue_draw_area (splash->area,
+                                expose.x, expose.y,
+                                expose.width, expose.height);
+
+  if ((text1 == NULL || ! g_strcmp0 (text1, splash->text1)) &&
+      (text2 == NULL || ! g_strcmp0 (text2, splash->text2)) &&
+      percentage == splash->percentage)
+    {
+      if (text1)
+        {
+          g_free (splash->text1);
+          splash->text1 = g_strdup (text1);
+        }
+
+      if (text2)
+        {
+          g_free (splash->text2);
+          splash->text2 = g_strdup (text2);
+        }
+
+      gtk_progress_bar_pulse (GTK_PROGRESS_BAR (splash->progress));
+    }
+  else
+    {
+      gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (splash->progress),
+                                     percentage);
+    }
+
+  splash->percentage = percentage;
+
+  if (splash->timer)
+    splash_timer_elapsed ();
+
+  if (gtk_events_pending ())
+    gtk_main_iteration ();
+}
+
+
+/*  private functions  */
+
+static gboolean
+splash_area_expose (GtkWidget      *widget,
+                    GdkEventExpose *event,
+                    GimpSplash     *splash)
+{
+  cairo_t *cr = gdk_cairo_create (event->window);
+
+  gdk_cairo_region (cr, event->region);
+  cairo_clip (cr);
+
+  gdk_cairo_set_source_color (cr, &splash->color);
+
+  cairo_move_to (cr, splash->upper_x, splash->upper_y);
+  pango_cairo_show_layout (cr, splash->upper);
+
+  cairo_move_to (cr, splash->lower_x, splash->lower_y);
+  pango_cairo_show_layout (cr, splash->lower);
+
+  cairo_destroy (cr);
+
+  return FALSE;
+}
+
+/* area returns the union of the previous and new ink rectangles */
+static void
+splash_position_layouts (GimpSplash   *splash,
+                         const gchar  *text1,
+                         const gchar  *text2,
+                         GdkRectangle *area)
+{
+  PangoRectangle  upper_ink;
+  PangoRectangle  upper_logical;
+  PangoRectangle  lower_ink;
+  PangoRectangle  lower_logical;
+  gint            text_height = 0;
+
+  if (text1)
+    {
+      pango_layout_get_pixel_extents (splash->upper, &upper_ink, NULL);
+
+      if (area)
+        splash_rectangle_union (area, &upper_ink,
+                                splash->upper_x, splash->upper_y);
+
+      pango_layout_set_text (splash->upper, text1, -1);
+      pango_layout_get_pixel_extents (splash->upper,
+                                      &upper_ink, &upper_logical);
+
+      splash->upper_x = (splash->width - upper_logical.width) / 2;
+      text_height += upper_logical.height;
+    }
+
+  if (text2)
+    {
+      pango_layout_get_pixel_extents (splash->lower, &lower_ink, NULL);
+
+      if (area)
+        splash_rectangle_union (area, &lower_ink,
+                                splash->lower_x, splash->lower_y);
+
+      pango_layout_set_text (splash->lower, text2, -1);
+      pango_layout_get_pixel_extents (splash->lower,
+                                      &lower_ink, &lower_logical);
+
+      splash->lower_x = (splash->width - lower_logical.width) / 2;
+      text_height += lower_logical.height;
+    }
+
+  /* For pretty printing, let's say we want at least double space. */
+  text_height *= 2;
+
+  /* The ordinates are computed in 2 steps, because we are first
+   * checking the minimal height needed for text (text_height).
+   *
+   * Ideally we are printing in the bottom quarter of the splash image,
+   * with well centered positions. But if this zone appears to be too
+   * small, we will end up using this previously computed text_height
+   * instead. Since splash images are designed to have text in the lower
+   * quarter, this may end up a bit uglier, but at least top and bottom
+   * texts won't overlay each other.
+   */
+  if (text1)
+    {
+      splash->upper_y = MIN (splash->height - text_height,
+                             splash->height * 13 / 16 -
+                             upper_logical.height / 2);
+
+      if (area)
+        splash_rectangle_union (area, &upper_ink,
+                                splash->upper_x, splash->upper_y);
+    }
+
+  if (text2)
+    {
+      splash->lower_y = ((splash->height + splash->upper_y) / 2 -
+                         lower_logical.height / 2);
+
+      if (area)
+        splash_rectangle_union (area, &lower_ink,
+                                splash->lower_x, splash->lower_y);
+    }
+}
+
+static void
+splash_rectangle_union (GdkRectangle   *dest,
+                        PangoRectangle *pango_rect,
+                        gint            offset_x,
+                        gint            offset_y)
+{
+  GdkRectangle  rect;
+
+  rect.x      = pango_rect->x + offset_x;
+  rect.y      = pango_rect->y + offset_y;
+  rect.width  = pango_rect->width;
+  rect.height = pango_rect->height;
+
+  if (dest->width > 0 && dest->height > 0)
+    gdk_rectangle_union (dest, &rect, dest);
+  else
+    *dest = rect;
+}
+
+/* This function chooses a gray value for the text color, based on
+ * the average luminance of the text area of the splash image.
+ */
+static gboolean
+splash_average_text_area (GimpSplash *splash,
+                          GdkPixbuf  *pixbuf,
+                          GdkColor   *color)
+{
+  const guchar *pixels;
+  gint          rowstride;
+  gint          channels;
+  gint          luminance = 0;
+  guint         sum[3]    = { 0, 0, 0 };
+  GdkRectangle  image     = { 0, 0, 0, 0 };
+  GdkRectangle  area      = { 0, 0, 0, 0 };
+
+  g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);
+  g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8, FALSE);
+
+  image.width  = gdk_pixbuf_get_width (pixbuf);
+  image.height = gdk_pixbuf_get_height (pixbuf);
+  rowstride    = gdk_pixbuf_get_rowstride (pixbuf);
+  channels     = gdk_pixbuf_get_n_channels (pixbuf);
+  pixels       = gdk_pixbuf_get_pixels (pixbuf);
+
+  splash_position_layouts (splash, MEASURE_UPPER, MEASURE_LOWER, &area);
+  splash_position_layouts (splash, "", "", NULL);
+
+  if (gdk_rectangle_intersect (&image, &area, &area))
+    {
+      const gint count = area.width * area.height;
+      gint       x, y;
+
+      pixels += area.x * channels;
+      pixels += area.y * rowstride;
+
+      for (y = 0; y < area.height; y++)
+        {
+          const guchar *src = pixels;
+
+          for (x = 0; x < area.width; x++)
+            {
+              sum[0] += src[0];
+              sum[1] += src[1];
+              sum[2] += src[2];
+
+              src += channels;
+            }
+
+          pixels += rowstride;
+        }
+
+      luminance = GIMP_RGB_LUMINANCE (sum[0] / count,
+                                      sum[1] / count,
+                                      sum[2] / count);
+
+      luminance = CLAMP0255 (luminance > 127 ?
+                             luminance - 223 : luminance + 223);
+
+    }
+
+  color->red = color->green = color->blue = (luminance << 8 | luminance);
+
+  return gdk_colormap_alloc_color (gtk_widget_get_colormap (splash->area),
+                                   color, FALSE, TRUE);
+}
+
+static GdkPixbufAnimation *
+splash_image_load (gint      max_width,
+                   gint      max_height,
+                   gboolean  be_verbose)
+{
+  GdkPixbufAnimation *animation = NULL;
+  gchar              *filename;
+  GFile              *file;
+  GList              *list;
+
+  /* File "gimp-splash.png" in personal configuration directory. */
+  filename = gimp_personal_rc_file ("gimp-splash.png");
+  animation = splash_image_load_from_path (filename,
+                                           max_width, max_height,
+                                           be_verbose);
+  g_free (filename);
+  if (animation)
+    return animation;
+
+  /* Random image under splashes/ directory in personal config dir. */
+  filename = gimp_personal_rc_file ("splashes");
+  file = g_file_new_for_path (filename);
+  g_free (filename);
+  list = NULL;
+  list = g_list_prepend (list, file);
+  animation = splash_image_pick_from_dirs (list,
+                                           max_width, max_height,
+                                           be_verbose);
+  g_list_free_full (list, g_object_unref);
+  if (animation)
+    return animation;
+
+  /* Release splash image. */
+  filename = g_build_filename (gimp_data_directory (),
+                               "images", "gimp-splash.png", NULL);
+  animation = splash_image_load_from_path (filename,
+                                           max_width, max_height,
+                                           be_verbose);
+  g_free (filename);
+  if (animation)
+    return animation;
+
+  /* Random release image in installed splashes/ directory. */
+  filename = g_build_filename (gimp_data_directory (), "splashes", NULL);
+  file = g_file_new_for_path (filename);
+  g_free (filename);
+  list = NULL;
+  list = g_list_prepend (list, file);
+  animation = splash_image_pick_from_dirs (list,
+                                           max_width, max_height,
+                                           be_verbose);
+  g_list_free_full (list, g_object_unref);
+
+  return animation;
+}
+
+static GdkPixbufAnimation *
+splash_image_load_from_path (const gchar *filename,
+                             gint         max_width,
+                             gint         max_height,
+                             gboolean     be_verbose)
+{
+  GdkPixbufAnimation *animation;
+  GFile              *file;
+
+  file = g_file_new_for_path (filename);
+  animation = splash_image_load_from_file (file,
+                                           max_width, max_height,
+                                           be_verbose);
+  g_object_unref (file);
+
+  return animation;
+}
+
+static GdkPixbufAnimation *
+splash_image_load_from_file (GFile    *file,
+                             gint      max_width,
+                             gint      max_height,
+                             gboolean  be_verbose)
+{
+  GdkPixbufAnimation *animation = NULL;
+  GFileInfo          *info;
+  GFileInputStream   *input;
+  gboolean            is_svg = FALSE;
+
+  if (be_verbose)
+    {
+      gchar *path;
+
+      path = g_file_get_path (file);
+
+      g_printerr ("Trying splash '%s' ... ", path);
+
+      g_free (path);
+    }
+
+  info = g_file_query_info (file,
+                            G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+                            G_FILE_QUERY_INFO_NONE, NULL, NULL);
+  if (info)
+    {
+      const gchar *content_type;
+
+      content_type = g_file_info_get_content_type (info);
+      if (content_type)
+        {
+          gchar *mime_type;
+
+          mime_type = g_content_type_get_mime_type (content_type);
+          if (mime_type)
+            {
+              if (g_strcmp0 (mime_type, "image/svg+xml") == 0)
+                {
+                  /* We want to treat vector images differently than
+                   * pixel images. We only scale down bitmaps, but we
+                   * don't try to scale them up.
+                   * On the other hand, we can always scale down and up
+                   * vector images so that they end up in an ideal size
+                   * in all cases.
+                   */
+                  is_svg = TRUE;
+                }
+              g_free (mime_type);
+            }
+        }
+      g_object_unref (info);
+    }
+
+  input = g_file_read (file, NULL, NULL);
+  if (input)
+    {
+      animation = gdk_pixbuf_animation_new_from_stream (G_INPUT_STREAM (input),
+                                                        NULL, NULL);
+      g_object_unref (input);
+    }
+
+  /* FIXME Right now, we only try to scale static images.
+   * Animated images may end up bigger than the expected max dimensions.
+   */
+  if (animation && gdk_pixbuf_animation_is_static_image (animation) &&
+      (gdk_pixbuf_animation_get_width (animation) > max_width        ||
+       gdk_pixbuf_animation_get_height (animation) > max_height      ||
+       is_svg))
+    {
+      GdkPixbuf *pixbuf;
+
+      input = g_file_read (file, NULL, NULL);
+      pixbuf = gdk_pixbuf_new_from_stream_at_scale (G_INPUT_STREAM (input),
+                                                    max_width, max_height,
+                                                    TRUE, NULL, NULL);
+      g_object_unref (input);
+      if (pixbuf)
+        {
+          GdkPixbufSimpleAnim *simple_anim = NULL;
+
+          simple_anim = gdk_pixbuf_simple_anim_new (gdk_pixbuf_get_width (pixbuf),
+                                                    gdk_pixbuf_get_height (pixbuf),
+                                                    1.0);
+          if (simple_anim)
+            {
+              gdk_pixbuf_simple_anim_add_frame (simple_anim, pixbuf);
+
+              g_object_unref (animation);
+              animation = GDK_PIXBUF_ANIMATION (simple_anim);
+            }
+          g_object_unref (pixbuf);
+        }
+    }
+
+  if (be_verbose)
+    g_printerr (animation ? "OK\n" : "failed\n");
+
+  return animation;
+}
+
+static GdkPixbufAnimation *
+splash_image_pick_from_dirs (GList    *dirs,
+                             gint      max_width,
+                             gint      max_height,
+                             gboolean  be_verbose)
+{
+  GdkPixbufAnimation *animation = NULL;
+  GList              *splashes = NULL;
+  GList              *iter;
+
+  for (iter = dirs; iter; iter = iter->next)
+    {
+      GFileEnumerator *enumerator;
+
+      enumerator = g_file_enumerate_children (iter->data,
+                                              G_FILE_ATTRIBUTE_STANDARD_NAME ","
+                                              G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
+                                              G_FILE_ATTRIBUTE_TIME_MODIFIED,
+                                              G_FILE_QUERY_INFO_NONE,
+                                              NULL, NULL);
+      if (enumerator)
+        {
+          GFileInfo *info;
+
+          while ((info = g_file_enumerator_next_file (enumerator, NULL, NULL)))
+            {
+              GFile *child;
+
+              child = g_file_enumerator_get_child (enumerator, info);
+              if (g_file_query_file_type (child,
+                                          G_FILE_QUERY_INFO_NONE,
+                                          NULL) == G_FILE_TYPE_REGULAR)
+                splashes = g_list_prepend (splashes, child);
+              else
+                g_object_unref (child);
+              g_object_unref (info);
+            }
+
+          g_object_unref (enumerator);
+        }
+    }
+
+  if (splashes)
+    {
+      gint32 i = g_random_int_range (0, g_list_length (splashes));
+
+      animation = splash_image_load_from_file (g_list_nth_data (splashes, i),
+                                               max_width, max_height,
+                                               be_verbose);
+      g_list_free_full (splashes, (GDestroyNotify) g_object_unref);
+    }
+
+  return animation;
+}
+
+static void
+splash_timer_elapsed (void)
+{
+  gdouble elapsed = g_timer_elapsed (splash->timer, NULL);
+
+  g_printerr ("%8g  %8g  -  %s %g%%  -  %s\n",
+              elapsed,
+              elapsed - splash->last_time,
+              splash->text1 ? splash->text1 : "",
+              splash->percentage * 100.0,
+              splash->text2 ? splash->text2 : "");
+
+  splash->last_time = elapsed;
+}
diff --git a/app/gui/splash.h b/app/gui/splash.h
new file mode 100644
index 0000000..a44f9b3
--- /dev/null
+++ b/app/gui/splash.h
@@ -0,0 +1,32 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SPLASH_H__
+#define __SPLASH_H__
+
+
+void   splash_create    (gboolean     be_verbose,
+                         GdkScreen   *screen,
+                         gint         monitor);
+void   splash_destroy   (void);
+
+void   splash_update    (const gchar *label1,
+                         const gchar *label2,
+                         gdouble      percentage);
+
+
+#endif /* __SPLASH_H__ */
diff --git a/app/gui/themes.c b/app/gui/themes.c
new file mode 100644
index 0000000..0307094
--- /dev/null
+++ b/app/gui/themes.c
@@ -0,0 +1,535 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <gegl.h>
+#ifdef GDK_DISABLE_DEPRECATED
+#undef GDK_DISABLE_DEPRECATED
+#endif
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "gui-types.h"
+
+#include "config/gimpguiconfig.h"
+
+#include "core/gimp.h"
+
+#include "themes.h"
+
+#include "gimp-intl.h"
+
+
+/*  local function prototypes  */
+
+static void   themes_write_style         (GimpGuiConfig          *config,
+                                          GOutputStream          *output,
+                                          GError                **error);
+static void   themes_apply_theme         (Gimp                   *gimp,
+                                          GimpGuiConfig          *config);
+static void   themes_list_themes_foreach (gpointer                key,
+                                          gpointer                value,
+                                          gpointer                data);
+static gint   themes_name_compare        (const void             *p1,
+                                          const void             *p2);
+static void   themes_theme_change_notify (GimpGuiConfig          *config,
+                                          GParamSpec             *pspec,
+                                          Gimp                   *gimp);
+
+static void   themes_fix_pixbuf_style    (void);
+static void   themes_draw_pixbuf_layout  (GtkStyle               *style,
+                                          GdkWindow              *window,
+                                          GtkStateType            state_type,
+                                          gboolean                use_text,
+                                          GdkRectangle           *area,
+                                          GtkWidget              *widget,
+                                          const gchar            *detail,
+                                          gint                    x,
+                                          gint                    y,
+                                          PangoLayout            *layout);
+
+/*  private variables  */
+
+static GHashTable    *themes_hash        = NULL;
+static GtkStyleClass *pixbuf_style_class = NULL;
+
+
+/*  public functions  */
+
+void
+themes_init (Gimp *gimp)
+{
+  GimpGuiConfig *config;
+  gchar         *themerc;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  config = GIMP_GUI_CONFIG (gimp->config);
+
+  themes_hash = g_hash_table_new_full (g_str_hash,
+                                       g_str_equal,
+                                       g_free,
+                                       g_object_unref);
+
+  if (config->theme_path)
+    {
+      GList *path;
+      GList *list;
+
+      path = gimp_config_path_expand_to_files (config->theme_path, NULL);
+
+      for (list = path; list; list = g_list_next (list))
+        {
+          GFile           *dir = list->data;
+          GFileEnumerator *enumerator;
+
+          enumerator =
+            g_file_enumerate_children (dir,
+                                       G_FILE_ATTRIBUTE_STANDARD_NAME ","
+                                       G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
+                                       G_FILE_ATTRIBUTE_STANDARD_TYPE,
+                                       G_FILE_QUERY_INFO_NONE,
+                                       NULL, NULL);
+
+          if (enumerator)
+            {
+              GFileInfo *info;
+
+              while ((info = g_file_enumerator_next_file (enumerator,
+                                                          NULL, NULL)))
+                {
+                  if (! g_file_info_get_is_hidden (info) &&
+                      g_file_info_get_file_type (info) == G_FILE_TYPE_DIRECTORY)
+                    {
+                      GFile       *file;
+                      const gchar *name;
+                      gchar       *basename;
+
+                      file = g_file_enumerator_get_child (enumerator, info);
+                      name = gimp_file_get_utf8_name (file);
+
+                      basename = g_path_get_basename (name);
+
+                      if (gimp->be_verbose)
+                        g_print ("Adding theme '%s' (%s)\n",
+                                 basename, name);
+
+                      g_hash_table_insert (themes_hash, basename, file);
+                    }
+
+                  g_object_unref (info);
+                }
+
+              g_object_unref (enumerator);
+            }
+        }
+
+      g_list_free_full (path, (GDestroyNotify) g_object_unref);
+    }
+
+  themes_apply_theme (gimp, config);
+
+  themerc = gimp_personal_rc_file ("themerc");
+  gtk_rc_parse (themerc);
+  g_free (themerc);
+
+  themes_fix_pixbuf_style ();
+
+  g_signal_connect (config, "notify::theme",
+                    G_CALLBACK (themes_theme_change_notify),
+                    gimp);
+  g_signal_connect (config, "notify::compact-sliders",
+                    G_CALLBACK (themes_theme_change_notify),
+                    gimp);
+}
+
+void
+themes_exit (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (themes_hash)
+    {
+      g_signal_handlers_disconnect_by_func (gimp->config,
+                                            themes_theme_change_notify,
+                                            gimp);
+
+      g_hash_table_destroy (themes_hash);
+      themes_hash = NULL;
+    }
+
+  g_clear_pointer (&pixbuf_style_class, g_type_class_unref);
+}
+
+gchar **
+themes_list_themes (Gimp *gimp,
+                    gint *n_themes)
+{
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (n_themes != NULL, NULL);
+
+  *n_themes = g_hash_table_size (themes_hash);
+
+  if (*n_themes > 0)
+    {
+      gchar **themes;
+      gchar **index;
+
+      themes = g_new0 (gchar *, *n_themes + 1);
+
+      index = themes;
+
+      g_hash_table_foreach (themes_hash, themes_list_themes_foreach, &index);
+
+      qsort (themes, *n_themes, sizeof (gchar *), themes_name_compare);
+
+      return themes;
+    }
+
+  return NULL;
+}
+
+GFile *
+themes_get_theme_dir (Gimp        *gimp,
+                      const gchar *theme_name)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+
+  if (! theme_name)
+    theme_name = GIMP_CONFIG_DEFAULT_THEME;
+
+  return g_hash_table_lookup (themes_hash, theme_name);
+}
+
+GFile *
+themes_get_theme_file (Gimp        *gimp,
+                       const gchar *first_component,
+                       ...)
+{
+  GimpGuiConfig *gui_config;
+  GFile         *file;
+  const gchar   *component;
+  va_list        args;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (first_component != NULL, NULL);
+
+  gui_config = GIMP_GUI_CONFIG (gimp->config);
+
+  file      = g_object_ref (themes_get_theme_dir (gimp, gui_config->theme));
+  component = first_component;
+
+  va_start (args, first_component);
+
+  do
+    {
+      GFile *tmp = g_file_get_child (file, component);
+      g_object_unref (file);
+      file = tmp;
+    }
+  while ((component = va_arg (args, gchar *)));
+
+  va_end (args);
+
+  if (! g_file_query_exists (file, NULL))
+    {
+      g_object_unref (file);
+
+      file      = g_object_ref (themes_get_theme_dir (gimp, NULL));
+      component = first_component;
+
+      va_start (args, first_component);
+
+      do
+        {
+          GFile *tmp = g_file_get_child (file, component);
+          g_object_unref (file);
+          file = tmp;
+        }
+      while ((component = va_arg (args, gchar *)));
+
+      va_end (args);
+    }
+
+  return file;
+}
+
+
+/*  private functions  */
+
+static void
+themes_write_style (GimpGuiConfig  *config,
+                    GOutputStream  *output,
+                    GError        **error)
+{
+  if (! *error)
+    {
+      g_output_stream_printf (
+        output, NULL, NULL, error,
+        "style \"gimp-spin-scale-style\"\n"
+        "{\n"
+        "  GimpSpinScale::compact = %d\n"
+        "}\n"
+        "\n"
+        "class \"GimpSpinScale\" style \"gimp-spin-scale-style\"\n"
+        "\n",
+        config->compact_sliders);
+    }
+}
+
+static void
+themes_apply_theme (Gimp          *gimp,
+                    GimpGuiConfig *config)
+{
+  GFile         *themerc;
+  GOutputStream *output;
+  GError        *error = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  themerc = gimp_directory_file ("themerc", NULL);
+
+  if (gimp->be_verbose)
+    g_print ("Writing '%s'\n", gimp_file_get_utf8_name (themerc));
+
+  output = G_OUTPUT_STREAM (g_file_replace (themerc,
+                                            NULL, FALSE, G_FILE_CREATE_NONE,
+                                            NULL, &error));
+  if (! output)
+    {
+      gimp_message_literal (gimp, NULL, GIMP_MESSAGE_ERROR, error->message);
+      g_clear_error (&error);
+    }
+  else
+    {
+      GFile  *theme_dir   = themes_get_theme_dir (gimp, config->theme);
+      GFile  *gtkrc_user;
+      GSList *gtkrc_files = NULL;
+      GSList *iter;
+
+      if (theme_dir)
+        {
+          gtkrc_files = g_slist_prepend (
+            gtkrc_files,
+            g_file_get_child (theme_dir, "gtkrc"));
+        }
+      else
+        {
+          /*  get the hardcoded default theme gtkrc  */
+          gtkrc_files = g_slist_prepend (
+            gtkrc_files,
+            g_file_new_for_path (gimp_gtkrc ()));
+        }
+
+      gtkrc_files = g_slist_prepend (
+        gtkrc_files,
+        gimp_sysconf_directory_file ("gtkrc", NULL));
+
+      gtkrc_user  = gimp_directory_file ("gtkrc", NULL);
+      gtkrc_files = g_slist_prepend (
+        gtkrc_files,
+        gtkrc_user);
+
+      gtkrc_files = g_slist_reverse (gtkrc_files);
+
+      g_output_stream_printf (
+        output, NULL, NULL, &error,
+        "# GIMP themerc\n"
+        "#\n"
+        "# This file is written on GIMP startup and on every theme change.\n"
+        "# It is NOT supposed to be edited manually. Edit your personal\n"
+        "# gtkrc file instead (%s).\n"
+        "\n",
+        gimp_file_get_utf8_name (gtkrc_user));
+
+      themes_write_style (config, output, &error);
+
+      for (iter = gtkrc_files; ! error && iter; iter = g_slist_next (iter))
+        {
+          GFile *file = iter->data;
+
+          if (g_file_query_exists (file, NULL))
+            {
+              gchar *path;
+              gchar *esc_path;
+
+              path     = g_file_get_path (file);
+              esc_path = g_strescape (path, NULL);
+              g_free (path);
+
+              g_output_stream_printf (
+                output, NULL, NULL, &error,
+                "include \"%s\"\n",
+                esc_path);
+
+              g_free (esc_path);
+            }
+        }
+
+      if (! error)
+        {
+          g_output_stream_printf (
+            output, NULL, NULL, &error,
+            "\n"
+            "# end of themerc\n");
+        }
+
+      if (error)
+        {
+          GCancellable *cancellable = g_cancellable_new ();
+
+          gimp_message (gimp, NULL, GIMP_MESSAGE_ERROR,
+                        _("Error writing '%s': %s"),
+                        gimp_file_get_utf8_name (themerc), error->message);
+          g_clear_error (&error);
+
+          /* Cancel the overwrite initiated by g_file_replace(). */
+          g_cancellable_cancel (cancellable);
+          g_output_stream_close (output, cancellable, NULL);
+          g_object_unref (cancellable);
+        }
+      else if (! g_output_stream_close (output, NULL, &error))
+        {
+          gimp_message (gimp, NULL, GIMP_MESSAGE_ERROR,
+                        _("Error closing '%s': %s"),
+                        gimp_file_get_utf8_name (themerc), error->message);
+          g_clear_error (&error);
+        }
+
+      g_slist_free_full (gtkrc_files, g_object_unref);
+      g_object_unref (output);
+    }
+
+  g_object_unref (themerc);
+}
+
+static void
+themes_list_themes_foreach (gpointer key,
+                            gpointer value,
+                            gpointer data)
+{
+  gchar ***index = data;
+
+  **index = g_strdup ((gchar *) key);
+
+  (*index)++;
+}
+
+static gint
+themes_name_compare (const void *p1,
+                     const void *p2)
+{
+  return strcmp (* (char **) p1, * (char **) p2);
+}
+
+static void
+themes_theme_change_notify (GimpGuiConfig *config,
+                            GParamSpec    *pspec,
+                            Gimp          *gimp)
+{
+  themes_apply_theme (gimp, config);
+
+  gtk_rc_reparse_all ();
+
+  themes_fix_pixbuf_style ();
+}
+
+static void
+themes_fix_pixbuf_style (void)
+{
+  /* This is a "quick'n dirty" trick to get appropriate colors for
+   * themes in GTK+2, and in particular dark themes which would display
+   * insensitive items with a barely readable layout.
+   *
+   * This piece of code partly duplicates code from GTK+2 (slightly
+   * modified to get readable insensitive items) and will likely have to
+   * be removed for GIMP 3.
+   *
+   * See https://bugzilla.gnome.org/show_bug.cgi?id=770424
+   */
+
+  if (! pixbuf_style_class)
+    {
+      GType type = g_type_from_name ("PixbufStyle");
+
+      if (type)
+        {
+          pixbuf_style_class = g_type_class_ref (type);
+
+          if (pixbuf_style_class)
+            pixbuf_style_class->draw_layout = themes_draw_pixbuf_layout;
+        }
+    }
+}
+
+static void
+themes_draw_pixbuf_layout (GtkStyle      *style,
+                           GdkWindow     *window,
+                           GtkStateType   state_type,
+                           gboolean       use_text,
+                           GdkRectangle  *area,
+                           GtkWidget     *widget,
+                           const gchar   *detail,
+                           gint           x,
+                           gint           y,
+                           PangoLayout   *layout)
+{
+  GdkGC *gc;
+
+  gc = use_text ? style->text_gc[state_type] : style->fg_gc[state_type];
+
+  if (area)
+    gdk_gc_set_clip_rectangle (gc, area);
+
+  if (state_type == GTK_STATE_INSENSITIVE)
+    {
+      GdkGC       *copy = gdk_gc_new (window);
+      GdkGCValues  orig;
+      GdkColor     fore;
+      guint16      r, g, b;
+
+      gdk_gc_copy (copy, gc);
+      gdk_gc_get_values (gc, &orig);
+
+      r = 0x40 + (((orig.foreground.pixel >> 16) & 0xff) >> 1);
+      g = 0x40 + (((orig.foreground.pixel >>  8) & 0xff) >> 1);
+      b = 0x40 + (((orig.foreground.pixel >>  0) & 0xff) >> 1);
+
+      fore.pixel = (r << 16) | (g << 8) | b;
+      fore.red   = r * 257;
+      fore.green = g * 257;
+      fore.blue  = b * 257;
+
+      gdk_gc_set_foreground (copy, &fore);
+      gdk_draw_layout (window, copy, x, y, layout);
+
+      g_object_unref (copy);
+    }
+  else
+    {
+      gdk_draw_layout (window, gc, x, y, layout);
+    }
+
+  if (area)
+    gdk_gc_set_clip_rectangle (gc, NULL);
+}
diff --git a/app/gui/themes.h b/app/gui/themes.h
new file mode 100644
index 0000000..0b7e74f
--- /dev/null
+++ b/app/gui/themes.h
@@ -0,0 +1,34 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __THEMES_H__
+#define __THEMES_H__
+
+
+void     themes_init           (Gimp        *gimp);
+void     themes_exit           (Gimp        *gimp);
+
+gchar ** themes_list_themes    (Gimp        *gimp,
+                                gint        *n_themes);
+GFile  * themes_get_theme_dir  (Gimp        *gimp,
+                                const gchar *theme_name);
+GFile  * themes_get_theme_file (Gimp        *gimp,
+                                const gchar *first_component,
+                                ...) G_GNUC_NULL_TERMINATED;
+
+
+#endif /* __THEMES_H__ */