dbus: /TrackList/DelTrack only deletes the track, not the item on the list
When deleting an item on the list the number returned by GetLength, does not decrement. When deleting an item from the middle of the list, a 'hole' is left in the list, where that track used to be. The following items on the list do not 'shuffle up'. Additionally, attempting to delete the item again sometimes causes lockups.