Performs an undo edit on this animation Undo edits are unusual in that they don't generate a 'reverse' operation (as they remove entries from the edit log), but they can change what's reported when retiring the edit. In particular a `PerformUndo` operation can become a `CompletedUndo` later on.
(&'a mut self, original_edit: &'a mut AnimationEdit, edit: &'a UndoEdit)
source not stored for this graph (policy: none)
no test coverage detected