Support removal of decks internally

[Owen Williams]

Right now [Master],num_decks can only go upwards because we don't support deck removal. Deck removal would need to take in to account the removal of a deck that is currently playing, and therefore the timing issues that come in to play when the enginemaster is performing reads on a buffer that has suddenly disappeared. Probably we will need an "is dying" flag so the deck can shut itself down cleanly.

[RJ Skerry-Ryan (rryan)]

Who is working on this for 1.12.0? There is a bunch of work involved. I'd like to tackle it eventually but won't have time to work on it for 1.12.

[Owen Williams (ywwg)]

I made a first attempt to work on this and failed: https://github.com/ywwg/mixxx/tree/deck_deletion

[RJ Skerry-Ryan (rryan)]

I don't think we can get this done for 1.12.0 -- theres a lot of work involved and it doesn't really get us anything high-priority.

[RJ Skerry-Ryan (rryan)]

Definitely not going to happen for 1.12, maybe 1.13 or 2.0?

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/7051