Adding upstream version 3.0.4.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

libgimpwidgets/gimpwidgets-error.c

@@ -0,0 +1,40 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpwidgets-error.c
+ * Copyright (C) 2008 Martin Nordholts <martinn@svn.gnome.org>
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "gimpwidgets-error.h"
+
+
+/**
+ * gimp_widgets_error_quark:
+ *
+ * This function is never called directly. Use GIMP_WIDGETS_ERROR() instead.
+ *
+ * Returns: the #GQuark that defines the GIMP widgets error domain.
+ **/
+GQuark
+gimp_widgets_error_quark (void)
+{
+  return g_quark_from_static_string ("gimp-widgets-error-quark");
+}