public override void RevokeSongEditCommand()
{
List <SongObject> overwriteList = new List <SongObject>();
SongEditAdd.ApplyAction(songObjects, overwriteList, extendedSustainsEnabled);
Debug.Assert(overwriteList.Count <= 0, "SongEditDelete revoke overwrote an object. Should be adding an object that was deleted.");
overwriteList.Clear();
SongEditAdd.ApplyAction(overwrittenSongObjects, overwriteList, extendedSustainsEnabled);
Debug.AssertFormat(overwriteList.Count == overwrittenSongObjects.Count, "SongEditDelete revoke overwrite invalid. OverwriteList = {0}, overwritten = {1}", overwriteList.Count, overwrittenSongObjects.Count);
overwrittenSongObjects.Clear();
}
