rem: g_return_if_fail (GST_IS_PLAY(bvw->priv->play));
add: g_return_if_fail (GST_IS_VIDEO_WIDGET(bvw->priv->vw));
context: bacon_video_widget_set_show_cursor (BaconVideoWidget *bvw, gboolean use_cursor){	g_return_if_fail (bvw != NULL);	g_return_if_fail (BACON_IS_VIDEO_WIDGET(bvw));	g_return_if_fail (GST_IS_PLAY(bvw->priv->play));	//	gst_video_widget_set_cursor_visible (GST_VIDEO_WIDGET(bvw->vw),//			use_cursor);}