Follow-up Comment #2, bug #21285 (project wesnoth):
I assumed that redo events actually were the same as regular actions.
Apparently we would need a redo event too. (In most cases, it would just fire
the original moveto event so that the same actions would occur. The redo event
would have to store the unit for that to work.)
I could just disallow undo, but the case I had in mind was a unit ability.
Some UMC authors have, in fact, disallowed undo for scenarios or entire
campaigns in order to use an ability like that. However, from the player's
standpoint, it seems like a frustrating bug. I'm not willing to do that to a
user, so I gave up on my idea instead.
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