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From: Mathias Dahl <brakjoller@hotmail.com>
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Subject: Re: undo an undo
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"Drew Adams" <drew.adams@oracle.com> writes:

> This means that you can undo undo, undo undo undo, etc. as much
> as you like (up to the undo-limit). You can play back and rewind
> the film as much as you like - the undo history keeps recording,
> however: all your playback and rewind actions are added to the
> history.

And when using the film-metaphor:

 http://article.gmane.org/gmane.emacs.sources/599

Mathias Dahl