The proposed change

• Some kind of undo buffer.
• Convert some big wins to use this (e.g. playlist deletion, playlist overwriting, Add undo support for the queue #1986, Prompt for playlist song removals #2675 )
• Control-z, or similar, enabled undoing the last thing
• Potentially a more VCS-reverting like thing where possible too, i.e. revert out of order etc

Benefits of this change

• Reduce the confirmation dialogs.
• Improve safety (esp around playlists, queues)

Any issues this might cause

Lots. It's tricky. Starters:

• Can we represent things globally for a start.
• How hard is it to hook into?
• What about plugins? (esp songsmenu plugins). Don't want to have to code dozens of individual cases, and yet...