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prxnvt
4b805d64bc
A drag merges its frames into one undo step by dropping a new step whose label matches the one before it. Its first frame did the same, so a second drag of an object (a move after a move, or a resize after a move) merged into the first drag's "Move Object" step, and one undo took back both. `Drag::Object` records whether the drag has made its step; only the later frames of the same drag merge into it. Test: a move and then a resize of a picture take two undos to reverse, the first restoring the moved picture.