NPC drag undo is broken #21
Description
Not entirely sure what's going on, but something simple like lining up five NPCs in a row, moving al of them to the side, and then undoing five times doesn't work as I'd expect, that is the NPCs aren't back in the row after a number of undo attempts. It seems undo moves them all to the same place. Valgrind is also reporting errors as that happens.