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diff --git a/src/ui/dialog/attrdialog.h b/src/ui/dialog/attrdialog.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief A dialog for XML attributes based on Gtk TreeView
+ */
+/* Authors:
+ *   Martin Owens
+ *
+ * Copyright (C) Martin Owens 2018 <doctormo@gmail.com>
+ *
+ * Released under GNU GPLv2 or later, read the file 'COPYING' for more information
+ */
+
+#ifndef SEEN_UI_DIALOGS_ATTRDIALOG_H
+#define SEEN_UI_DIALOGS_ATTRDIALOG_H
+
+#include <gtkmm/builder.h>
+#include <gtkmm/dialog.h>
+#include <gtkmm/liststore.h>
+#include <gtkmm/popover.h>
+#include <gtkmm/scrolledwindow.h>
+#include <gtkmm/textview.h>
+#include <gtkmm/treeview.h>
+#include <memory>
+
+#include "helper/auto-connection.h"
+#include "inkscape-application.h"
+#include "message.h"
+#include "ui/dialog/dialog-base.h"
+#include "ui/syntax.h"
+#include "xml/node-observer.h"
+
+namespace Inkscape {
+class MessageStack;
+class MessageContext;
+namespace UI {
+namespace Dialog {
+
+/**
+ * @brief The AttrDialog class
+ * This dialog allows to add, delete and modify XML attributes created in the
+ * xml editor.
+ */
+class AttrDialog
+	: public DialogBase
+	, private XML::NodeObserver
+{
+public:
+    AttrDialog();
+    ~AttrDialog() override;
+
+    void setRepr(Inkscape::XML::Node * repr);
+    Gtk::ScrolledWindow& get_scrolled_window() { return _scrolled_window; }
+    Gtk::Box& get_status_box() { return _status_box; }
+    void adjust_popup_edit_size();
+    void set_mono_font(bool mono);
+
+private:
+    // builder comes first, so it is initialized before other data members
+    Glib::RefPtr<Gtk::Builder> _builder;
+
+    // Data structure
+    class AttrColumns : public Gtk::TreeModel::ColumnRecord
+    {
+    public:
+        AttrColumns()
+        {
+            add(_attributeName);
+            add(_attributeValue);
+            add(_attributeValueRender);
+        }
+        Gtk::TreeModelColumn<Glib::ustring> _attributeName;
+        Gtk::TreeModelColumn<Glib::ustring> _attributeValue;
+        Gtk::TreeModelColumn<Glib::ustring> _attributeValueRender;
+    };
+    AttrColumns _attrColumns;
+
+    // TreeView
+    Gtk::TreeView& _treeView;
+    Glib::RefPtr<Gtk::ListStore> _store;
+    Gtk::CellRendererText *_nameRenderer;
+    Gtk::CellRendererText *_valueRenderer;
+    Gtk::TreeViewColumn *_nameCol;
+    Gtk::TreeViewColumn *_valueCol;
+    Gtk::Popover *_popover;
+    Glib::ustring _value_path;
+    Glib::ustring _value_editing;
+    // Status bar
+    std::shared_ptr<Inkscape::MessageStack> _message_stack;
+    std::unique_ptr<Inkscape::MessageContext> _message_context;
+    // Widgets
+    Gtk::ScrolledWindow& _scrolled_window;
+    Gtk::ScrolledWindow& _scrolled_text_view;
+    // Variables - Inkscape
+    Inkscape::XML::Node* _repr{nullptr};
+    Gtk::Box& _status_box;
+    Gtk::Label& _status;
+    bool _updating = true;
+
+    // Helper functions
+    void setUndo(Glib::ustring const &event_description);
+    /**
+     * Sets the XML status bar, depending on which attr is selected.
+     */
+    void attr_reset_context(gint attr);
+
+    /**
+     * Signal handlers
+     */
+    auto_connection _message_changed_connection;
+    bool onNameKeyPressed(GdkEventKey *event, Gtk::Entry *entry);
+    bool onValueKeyPressed(GdkEventKey *event, Gtk::Entry *entry);
+    void onAttrDelete(Glib::ustring path);
+    bool onAttrCreate(GdkEventButton *event);
+    bool onKeyPressed(GdkEventKey *event);
+    void truncateDigits() const;
+    void popClosed();
+    void startNameEdit(Gtk::CellEditable *cell, const Glib::ustring &path);
+    void startValueEdit(Gtk::CellEditable *cell, const Glib::ustring &path);
+    void nameEdited(const Glib::ustring &path, const Glib::ustring &name);
+    void valueEdited(const Glib::ustring &path, const Glib::ustring &value);
+    void valueEditedPop();
+    void storeMoveToNext(Gtk::TreeModel::Path modelpath);
+
+private:
+    // Text/comment nodes
+    Gtk::ScrolledWindow& _content_sw;
+    std::unique_ptr<Syntax::TextEditView> _text_edit;  // text content editing (plain text)
+    std::unique_ptr<Syntax::TextEditView> _style_edit; // embedded CSS style (with syntax coloring)
+
+    // Attribute value editing
+    std::unique_ptr<Syntax::TextEditView> _css_edit;    // in-line CSS style
+    std::unique_ptr<Syntax::TextEditView> _svgd_edit;   // SVG path data
+    std::unique_ptr<Syntax::TextEditView> _points_edit; // points in a <polygon> or <polyline>
+    std::unique_ptr<Syntax::TextEditView> _attr_edit;   // all other attributes (plain text)
+    Syntax::TextEditView* _current_text_edit = nullptr; // current text edit for attribute value editing
+    auto_connection _adjust_size;
+    auto_connection _close_popup;
+    int _rounding_precision = 0;
+
+    bool key_callback(GdkEventKey* event);
+    void notifyAttributeChanged(XML::Node &repr, GQuark name, Util::ptr_shared old_value, Util::ptr_shared new_value) final;
+	void notifyContentChanged(XML::Node &node, Util::ptr_shared old_content, Util::ptr_shared new_content) final;
+    static Glib::ustring round_numbers(const Glib::ustring& text, int precision);
+    Gtk::TextView &_activeTextView() const;
+    void set_current_textedit(Syntax::TextEditView* edit);
+    static std::unique_ptr<Syntax::TextEditView> init_text_view(AttrDialog* owner, Syntax::SyntaxMode coloring, bool map);
+};
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // SEEN_UI_DIALOGS_ATTRDIALOG_H