semantics of deleting a track

[ichthyo]

See in TiddlyWiki renderengine.html#TrackHandling
The considerations there are partially outdated now, but basically correct.

We have to distinguish some cases

• deleting a track asset. Is this even possible, given the fact that track assets are created on referral?
• deleting a track MObject. Do we want to allow that? Usually, MObjects are handled automatically. Thus we'd need a dedicated purge function
• removing a Placement<Track> from the session. The PlacementIndex doesn't allow this, unless the scope defined by this track is already empty. Do we want/need a "kill complete scope"-operation?

The mentioned wiki page also considers a functionality similar to Ardour's "Playlist". But meanwhile it looks that we won't get this as a sideeffect from track handling. But, on the other hand we have sequences now? Is that reasoning valid?

[ichthyo]

important, but not relevant right now