rem: gdk_threads_enter ();
context: gst_video_widget_set_event_catcher (GstVideoWidget *vw, gboolean event_catcher){	g_return_val_if_fail(vw != NULL, FALSE);	g_return_val_if_fail (GST_IS_VIDEO_WIDGET (vw), FALSE);		gdk_threads_enter ();		vw->event_catcher = event_catcher;		gst_video_widget_reorder_windows (vw);		gdk_threads_leave ();		return TRUE;}