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diff --git a/src/ui/dialog/panel-dialog.h b/src/ui/dialog/panel-dialog.h
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+++ b/src/ui/dialog/panel-dialog.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief A panel holding dialog
+ */
+/* Authors:
+ *   C 2007 Gustav Broberg <broberg@kth.se>
+ *   C 2012 Kris De Gussem <Kris.DeGussem@gmail.com>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_PANEL_DIALOG_H
+#define INKSCAPE_PANEL_DIALOG_H
+
+#include <glibmm/i18n.h>
+#include <gtkmm/dialog.h>
+
+#include "verbs.h"
+#include "dialog.h"
+#include "ui/dialog/swatches.h"
+#include "ui/dialog/floating-behavior.h"
+#include "ui/dialog/dock-behavior.h"
+#include "inkscape.h"
+#include "desktop.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+
+/**
+ * Auxiliary class for the link between UI::Dialog::PanelDialog and UI::Dialog::Dialog.
+ *
+ * PanelDialog handles signals emitted when a desktop changes, either changing to a
+ * different desktop or a new document.
+ */
+class PanelDialogBase {
+public:
+    PanelDialogBase(UI::Widget::Panel &panel, char const */*prefs_path*/, int const /*verb_num*/) :
+      _panel (panel) { }
+
+    virtual void present() = 0;
+    virtual ~PanelDialogBase() = default;
+
+    virtual UI::Widget::Panel &getPanel() { return _panel; }
+
+protected:
+
+    inline virtual void _propagateDocumentReplaced(SPDesktop* desktop, SPDocument *document);
+    inline virtual void _propagateDesktopActivated(SPDesktop *);
+    inline virtual void _propagateDesktopDeactivated(SPDesktop *);
+
+    UI::Widget::Panel &_panel;
+    sigc::connection _document_replaced_connection;
+};
+
+/**
+ * Bridges UI::Widget::Panel and UI::Dialog::Dialog.
+ *
+ * Where Dialog handles window behaviour, such as closing, position, etc, and where
+ * Panel is the actual container for dialog child widgets (and from where the dialog
+ * content is made), PanelDialog links these two classes together to create a
+ * dockable and floatable dialog. The link with Dialog is made via PanelDialogBase.
+ */
+template <typename Behavior>
+class PanelDialog : public PanelDialogBase, public Inkscape::UI::Dialog::Dialog {
+
+public:
+    /**
+     * Constructor.
+     * 
+     * @param contents panel with the actual dialog content.
+     * @param prefs_path characteristic path for loading/saving dialog position.
+     * @param verb_num the dialog verb.
+     */
+    PanelDialog(UI::Widget::Panel &contents, char const *prefs_path, int const verb_num);
+
+    ~PanelDialog() override = default;
+
+    template <typename T>
+    static PanelDialog<Behavior> *create();
+
+    inline void present() override;
+
+private:
+    template <typename T>
+    static PanelDialog<Behavior> *_create();
+
+    inline void _presentDialog();
+
+    PanelDialog() = delete;
+    PanelDialog(PanelDialog<Behavior> const &d) = delete;                      // no copy
+    PanelDialog<Behavior>& operator=(PanelDialog<Behavior> const &d) = delete; // no assign
+};
+
+
+void PanelDialogBase::_propagateDocumentReplaced(SPDesktop *desktop, SPDocument *document)
+{
+    _panel.signalDocumentReplaced().emit(desktop, document);
+}
+
+void PanelDialogBase::_propagateDesktopActivated(SPDesktop *desktop)
+{
+    _document_replaced_connection =
+        desktop->connectDocumentReplaced(sigc::mem_fun(*this, &PanelDialogBase::_propagateDocumentReplaced));
+    _panel.signalActivateDesktop().emit(desktop);
+}
+
+void PanelDialogBase::_propagateDesktopDeactivated(SPDesktop *desktop)
+{
+    _document_replaced_connection.disconnect();
+    _panel.signalDeactiveDesktop().emit(desktop);
+}
+
+
+template <typename B>
+PanelDialog<B>::PanelDialog(Widget::Panel &panel, char const *prefs_path, int const verb_num) :
+    PanelDialogBase(panel, prefs_path, verb_num),
+    Dialog(&B::create, prefs_path, verb_num)
+{
+    Gtk::Box *vbox = get_vbox();
+    _panel.signalResponse().connect(sigc::mem_fun(*this, &PanelDialog::_handleResponse));
+    _panel.signalPresent().connect(sigc::mem_fun(*this, &PanelDialog::_presentDialog));
+
+    vbox->pack_start(_panel, true, true, 0);
+
+    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
+
+    _propagateDesktopActivated(desktop);
+
+    _document_replaced_connection =
+        desktop->connectDocumentReplaced(sigc::mem_fun(*this, &PanelDialog::_propagateDocumentReplaced));
+
+    show_all_children();
+}
+
+template <typename B> template <typename P>
+PanelDialog<B> *PanelDialog<B>::create()
+{
+    return _create<P>();
+}
+
+template <typename B> template <typename P>
+PanelDialog<B> *PanelDialog<B>::_create()
+{
+    UI::Widget::Panel &panel = P::getInstance();
+    return new PanelDialog<B>(panel, panel.getPrefsPath(), panel.getVerb());
+}
+
+template <typename B>
+void PanelDialog<B>::present()
+{
+    _panel.present();
+}
+
+template <typename B>
+void PanelDialog<B>::_presentDialog()
+{
+    Dialog::present();
+}
+
+template <> inline
+void PanelDialog<Behavior::FloatingBehavior>::present()
+{
+    Dialog::present();
+    _panel.present();
+}
+
+template <> inline
+void PanelDialog<Behavior::FloatingBehavior>::_presentDialog()
+{
+}
+
+/**
+ * Specialized factory method for panel dialogs with floating behavior in order to make them work as
+ * singletons, i.e. allow them track the current active desktop.
+ */
+template <>
+template <typename P>
+PanelDialog<Behavior::FloatingBehavior> *PanelDialog<Behavior::FloatingBehavior>::create()
+{
+    auto instance = _create<P>();
+
+    INKSCAPE.signal_activate_desktop.connect(
+            sigc::mem_fun(*instance, &PanelDialog<Behavior::FloatingBehavior>::_propagateDesktopActivated)
+    );
+    INKSCAPE.signal_deactivate_desktop.connect(        
+            sigc::mem_fun(*instance, &PanelDialog<Behavior::FloatingBehavior>::_propagateDesktopDeactivated)
+    );
+
+    return instance;
+}
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif //INKSCAPE_PANEL_DIALOG_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 :