Add AltGr behavior option to layout

Author: Peter Czibik

src/Views/Layout.vala

@@ -110,6 +110,18 @@ namespace Pantheon.Keyboard {
                                                 korean_layouts_panel (),
                                                 third_level_layouts_panel ()};
 
+            var alt_gr_label = new SettingsLabel (_("AltGr behavior:"), size_group[0]);
+
+            // AltGr key functionality
+            modifier = new XkbModifier ();
+            modifier.append_xkb_option ("", _("Default"));
+            modifier.append_xkb_option ("ctrl:ralt_rctrl", _("as Ctrl"));
+
+            modifier.set_default_command ("");
+            settings.add_xkb_modifier (modifier);
+
+            var alt_gr_combo = new XkbComboBox (modifier, size_group[1]);
+
             advanced_settings = new AdvancedSettings (panels);
 
             entry_test = new Gtk.Entry () {
@@ -131,6 +143,8 @@ namespace Pantheon.Keyboard {
             attach (overlay_key_combo, 2, 2, 1, 1);
             attach (caps_lock_label, 1, 3, 1, 1);
             attach (caps_lock_combo, 2, 3, 1, 1);
+            attach (alt_gr_label, 1, 4, 1, 1);
+            attach (alt_gr_combo, 2, 4, 1, 1);
             attach (advanced_settings, 1, 4, 2);
 
             if (GLib.SettingsSchemaSource.get_default ().lookup ("io.elementary.wingpanel.keyboard", true) != null) {