gdk_window_set_user_data(drawingarea->clip_window, NULL);
moz_drawingarea_finalize (GObject *object){    MozDrawingarea *drawingarea;    g_return_if_fail(IS_MOZ_DRAWINGAREA(object));    drawingarea = MOZ_DRAWINGAREA(object);    gdk_window_destroy(drawingarea->inner_window);    gdk_window_destroy(drawingarea->clip_window);    (* parent_class->finalize) (object);}