Undo

It's easy to make a mistake: mark the wrong task as done, or hit enter before noticing a typo in a tag name. The ta undo command makes it just as easy to fix the mistake, by effectively reversing the most recent change. Multiple invocations of ta undo can be used to undo multiple changes.

The limit of this functionality is that changes which have been synchronized to the server (via ta sync) cannot be undone.