[Denemo-devel] Undo during playback

[Richard Shann]

Nils reported a crash using undo during playback. It looks like this
would happen if the undo involved a snapshot, since the entire
DenemoScore is being replaced which the playback is using.
However, I have not been able to provoke such a crash.
I have code ready to stop playback if the Undo/Redo triggers a snapshot
- you would still be able to tinker around with notes adding, deleting,
changing etc, just not change the score title or add a staff etc.
But I am not sure if I should commit it - Nils' crash may have been
un-related... Need more feedback.

Richard