rem: D("playlist_changed_cb");
context: playlist_changed_cb (GtkWidget *playlist, gpointer user_data){	Totem *totem = (Totem *) user_data;	char *mrl;	D("playlist_changed_cb");	update_buttons (totem);	mrl = gtk_playlist_get_current_mrl (totem->playlist);	if (totem->mrl == NULL			|| (totem->mrl != NULL && mrl != NULL			&& strcmp (totem->mrl, mrl) != 0))	{		totem_action_set_mrl_and_play (totem, mrl);	} else if (totem->mrl != NULL) {		gtk_playlist_set_playing (totem->playlist, TRUE);	}	g_free (mrl);}