It cause to crash with gtk+ from git master:
$ ./gedit/gedit 

(lt-gedit:6446): Gtk-CRITICAL **: Error building template class 'GeditWindow' for an instance of type 'GeditWindow': Template parent type `GtkWindow' does not match instance parent type `GtkApplicationWindow'.
sys:1: Warning: g_object_bind_property_full: assertion 'G_IS_OBJECT (source)' failed

(lt-gedit:6446): GLib-GIO-CRITICAL **: g_settings_bind_with_mapping: assertion 'G_IS_OBJECT (object)' failed
sys:1: Warning: invalid (NULL) pointer instance
sys:1: Warning: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_menu_button_set_menu_model: assertion 'GTK_IS_MENU_BUTTON (menu_button)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_menu_button_set_menu_model: assertion 'GTK_IS_MENU_BUTTON (menu_button)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_statusbar_get_context_id: assertion 'GTK_IS_STATUSBAR (statusbar)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_statusbar_get_context_id: assertion 'GTK_IS_STATUSBAR (statusbar)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_statusbar_get_context_id: assertion 'GTK_IS_STATUSBAR (statusbar)' failed

(lt-gedit:6446): GLib-GIO-CRITICAL **: g_settings_bind_with_mapping: assertion 'G_IS_OBJECT (object)' failed

(lt-gedit:6446): Gtk-CRITICAL **: gtk_menu_button_set_menu_model: assertion 'GTK_IS_MENU_BUTTON (menu_button)' failed
Segmentation fault (core dumped)