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How does this differ from 'undo' with a slider bar interface and auto-save?

• mbreese 17y ago
  Functionally, it doesn't. You can get the same effect by repeatedly hitting "undo" until you have a blank screen. Then you can play it back using "redo" until you reach the end. The big features are the nice GUI for it and the persistence of the history. This would be like saving each "undo-able" action with the document. Though, you could also do this by using log-style persistence, saving only the accumulated changes and playing them all back to get the final document. I assume thought that their 'bookmarks' are snapshotted complete copies of the document to limit the 'playback' required.
• akkartik 17y ago
  It gives undo a 'performance art' aspect. Watching PG write is valuable.