rem: D("gtk_playlist_set_at_start");
context: gtk_playlist_set_at_start (GtkPlaylist *playlist){	GtkTreeIter iter;	D("gtk_playlist_set_at_start");	g_return_if_fail (GTK_IS_PLAYLIST (playlist));	gtk_playlist_unset_playing (playlist);	if (playlist->_priv->current != NULL)	{		gtk_tree_path_free (playlist->_priv->current);		playlist->_priv->current = NULL;	}	update_current_from_playlist (playlist);}