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diff --git a/src/ui/dialog/filedialogimpl-gtkmm.h b/src/ui/dialog/filedialogimpl-gtkmm.h
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+++ b/src/ui/dialog/filedialogimpl-gtkmm.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Implementation of the file dialog interfaces defined in filedialogimpl.h
+ */
+/* Authors:
+ *   Bob Jamison
+ *   Johan Engelen <johan@shouraizou.nl>
+ *   Joel Holdsworth
+ *   Bruno Dilly
+ *   Other dudes from The Inkscape Organization
+ *
+ * Copyright (C) 2004-2008 Authors
+ * Copyright (C) 2004-2007 The Inkscape Organization
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef __FILE_DIALOGIMPL_H__
+#define __FILE_DIALOGIMPL_H__
+
+//Gtk includes
+#include <gtkmm/filechooserdialog.h>
+#include <glib/gstdio.h>
+
+#include "filedialog.h"
+#include "svg-preview.h"
+
+namespace Gtk {
+class CheckButton;
+class ComboBoxText;
+class Expander;
+}
+
+namespace Inkscape {
+  class URI;
+
+namespace UI {
+
+namespace View {
+  class SVGViewWidget;
+}
+
+namespace Dialog {
+
+/*#########################################################################
+### Utility
+#########################################################################*/
+
+void
+findEntryWidgets(Gtk::Container *parent,
+                 std::vector<Gtk::Entry *> &result);
+
+void
+findExpanderWidgets(Gtk::Container *parent,
+                    std::vector<Gtk::Expander *> &result);
+
+/*#########################################################################
+### F I L E     D I A L O G    B A S E    C L A S S
+#########################################################################*/
+
+/**
+ * This class is the base implementation for the others.  This
+ * reduces redundancies and bugs.
+ */
+class FileDialogBaseGtk : public Gtk::FileChooserDialog
+{
+public:
+
+    FileDialogBaseGtk(Gtk::Window& parentWindow, const Glib::ustring &title,
+    		Gtk::FileChooserAction dialogType, FileDialogType type, gchar const* preferenceBase) :
+        Gtk::FileChooserDialog(parentWindow, title, dialogType),
+        preferenceBase(preferenceBase ? preferenceBase : "unknown"),
+        _dialogType(type)
+    {
+        internalSetup();
+    }
+
+    FileDialogBaseGtk(Gtk::Window& parentWindow, const char *title,
+                   Gtk::FileChooserAction dialogType, FileDialogType type, gchar const* preferenceBase) :
+        Gtk::FileChooserDialog(parentWindow, title, dialogType),
+        preferenceBase(preferenceBase ? preferenceBase : "unknown"),
+        _dialogType(type)
+    {
+        internalSetup();
+    }
+
+    ~FileDialogBaseGtk() override = default;
+
+    /**
+     * Add a Gtk filter to our specially controlled filter dropdown.
+     */
+    Glib::RefPtr<Gtk::FileFilter> addFilter(const Glib::ustring &name, Glib::ustring pattern = "",
+                                            Inkscape::Extension::Extension *mod = nullptr);
+
+    Glib::ustring extToPattern(const Glib::ustring &extension) const;
+
+    virtual void filterChangedCallback() {}
+
+protected:
+    void cleanup( bool showConfirmed );
+
+    Glib::ustring const preferenceBase;
+    /**
+     * What type of 'open' are we? (open, import, place, etc)
+     */
+    FileDialogType _dialogType;
+
+    /**
+     * Our svg preview widget
+     */
+    SVGPreview svgPreview;
+
+    /**
+     * Child widgets
+     */
+    Gtk::CheckButton previewCheckbox;
+    Gtk::CheckButton svgexportCheckbox;
+
+    /**
+     * Aquired Widgets
+     */
+    Gtk::ComboBoxText *filterComboBox;
+
+private:
+    void internalSetup();
+
+    /**
+     * Callback for seeing if the preview needs to be drawn
+     */
+    void _updatePreviewCallback();
+
+    /**
+     * Callback to for SVG 2 to SVG 1.1 export.
+     */
+    void _svgexportEnabledCB();
+
+    /**
+     * Overriden filter store.
+     */
+    Glib::RefPtr<Gtk::ListStore> filterStore;
+};
+
+
+
+
+/*#########################################################################
+### F I L E    O P E N
+#########################################################################*/
+
+/**
+ * Our implementation class for the FileOpenDialog interface..
+ */
+class FileOpenDialogImplGtk : public FileOpenDialog, public FileDialogBaseGtk
+{
+public:
+
+    FileOpenDialogImplGtk(Gtk::Window& parentWindow,
+    		       const Glib::ustring &dir,
+                       FileDialogType fileTypes,
+                       const Glib::ustring &title);
+
+    ~FileOpenDialogImplGtk() override = default;
+
+    bool show() override;
+
+    Glib::ustring getFilename();
+
+    std::vector<Glib::ustring> getFilenames() override;
+
+    Glib::ustring getCurrentDirectory() override;
+
+    void addFilterMenu(const Glib::ustring &name, Glib::ustring pattern = "",
+                       Inkscape::Extension::Extension *mod = nullptr) override
+    {
+        addFilter(name, pattern, mod);
+    }
+
+private:
+
+    /**
+     *  Create a filter menu for this type of dialog
+     */
+    void createFilterMenu();
+};
+
+
+
+//########################################################################
+//# F I L E    S A V E
+//########################################################################
+
+/**
+ * Our implementation of the FileSaveDialog interface.
+ */
+class FileSaveDialogImplGtk : public FileSaveDialog, public FileDialogBaseGtk
+{
+
+public:
+    FileSaveDialogImplGtk(Gtk::Window &parentWindow,
+                          const Glib::ustring &dir,
+                          FileDialogType fileTypes,
+                          const Glib::ustring &title,
+                          const Glib::ustring &default_key,
+                          const gchar* docTitle,
+                          const Inkscape::Extension::FileSaveMethod save_method);
+
+    ~FileSaveDialogImplGtk() override = default;
+
+    bool show() override;
+
+    Glib::ustring getCurrentDirectory() override;
+
+    void setExtension(Inkscape::Extension::Extension *key) override;
+
+    void addFilterMenu(const Glib::ustring &name, Glib::ustring pattern = "",
+                       Inkscape::Extension::Extension *mod = nullptr) override
+    {
+        addFilter(name, pattern, mod);
+    }
+
+private:
+    //void change_title(const Glib::ustring& title);
+    void change_path(const Glib::ustring& path);
+    void updateNameAndExtension();
+
+    /**
+     * The file save method (essentially whether the dialog was invoked by "Save as ..." or "Save a
+     * copy ..."), which is used to determine file extensions and save paths.
+     */
+    Inkscape::Extension::FileSaveMethod save_method;
+
+    /**
+     * Fix to allow the user to type the file name
+     */
+    Gtk::Entry *fileNameEntry;
+    Gtk::Box childBox;
+    Gtk::Box checksBox;
+    Gtk::CheckButton fileTypeCheckbox;
+
+    /**
+     * Callback for user input into fileNameEntry
+     */
+    void filterChangedCallback() override;
+
+    /**
+     *  Create a filter menu for this type of dialog
+     */
+    void createFilterMenu();
+
+    /**
+     * Callback for user input into fileNameEntry
+     */
+    void fileNameEntryChangedCallback();
+    void fileNameChanged();
+    bool fromCB;
+};
+
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif /*__FILE_DIALOGIMPL_H__*/
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :