sounds like a perfect solution on one hand, if only to revert one step backwards in the selection set. But it might create the need for extra undo steps for many other situations. and since Moi has no feedback for what action is being undone, it may create a problem for someone who intends to undo the last action, but not realize they've only undone the last selection. Maybe they realize 50 steps later that something was not undone properly... So i think this "revert selection" would best be handled in one of two ways:

1) have a seperate undo stack (and seperate command) for selection states. Maybe not the best idea though.

OR

2) limit the undo function to act only on selection states within a running command. Selection state is cleared when the command is cancelled or completed.

jonah