How does Undo work?

Posted by dontWatchMyProfile on Stack Overflow See other posts from Stack Overflow or by dontWatchMyProfile
Published on 2010-06-10T15:57:27Z Indexed on 2010/06/10 16:13 UTC
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How does undo work? Does it copy all the managed objects every time any of the values change? Or does it only copy the actual changes together with an information which objects were affected? Is that heavy or lightweight?

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