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diff --git a/src/ui/dialog/dock-behavior.h b/src/ui/dialog/dock-behavior.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief A dockable dialog implementation.
+ */
+/* Author:
+ *   Gustav Broberg <broberg@kth.se>
+ *
+ * Copyright (C) 2007 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#ifndef INKSCAPE_UI_DIALOG_DOCK_BEHAVIOR_H
+#define INKSCAPE_UI_DIALOG_DOCK_BEHAVIOR_H
+
+#include "ui/widget/dock-item.h"
+#include "behavior.h"
+
+namespace Gtk {
+	class Paned;
+}
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+namespace Behavior {
+
+class DockBehavior : public Behavior {
+
+public:
+    static Behavior *create(Dialog& dialog);
+
+    ~DockBehavior() override;
+
+    /** Gtk::Dialog methods */
+    operator Gtk::Widget&() override;
+    GtkWidget *gobj() override;
+    void present() override;
+    Gtk::VBox *get_vbox() override;
+    void show() override;
+    void hide() override;
+    void show_all_children() override;
+    void resize(int width, int height) override;
+    void move(int x, int y) override;
+    void set_position(Gtk::WindowPosition) override;
+    void set_size_request(int width, int height) override;
+    void size_request(Gtk::Requisition& requisition) override;
+    void get_position(int& x, int& y) override;
+    void get_size(int& width, int& height) override;
+    void set_title(Glib::ustring title) override;
+    void set_sensitive(bool sensitive) override;
+
+    /** Gtk::Dialog signal proxies */
+    Glib::SignalProxy0<void> signal_show() override;
+    Glib::SignalProxy0<void> signal_hide() override;
+    Glib::SignalProxy1<bool, GdkEventAny *> signal_delete_event() override;
+    Glib::SignalProxy0<void> signal_drag_begin();
+    Glib::SignalProxy1<void, bool> signal_drag_end();
+
+    /** Custom signal handlers */
+    void onHideF12() override;
+    void onShowF12() override;
+    void onDesktopActivated(SPDesktop *desktop) override;
+    void onShutdown() override;
+
+private:
+    Widget::DockItem _dock_item;
+
+    DockBehavior(Dialog& dialog);
+
+    /** Internal helpers */
+    Gtk::Paned *_getPaned();              //< gives the parent pane, if the dock item has one
+    void _requestHeight(int height);      //< tries to resize the dock item to the requested height
+
+    /** Internal signal handlers */
+    void _onHide();
+    void _onShow();
+    bool _onDeleteEvent(GdkEventAny *event);
+    void _onStateChanged(Widget::DockItem::State prev_state, Widget::DockItem::State new_state);
+    bool _onKeyPress(GdkEventKey *event);
+
+    sigc::connection _signal_hide_connection;
+    sigc::connection _signal_key_press_event_connection;
+
+};
+
+} // namespace Behavior
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_DIALOG_DOCK_BEHAVIOR_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 :