On Mon, 2009-05-11 at 12:57 -0700, Stuart Axon wrote:
> Even if you don't have undo as such, it would be useful from  a
> scripting point of view to save checkpoints, which you could
> revert to within the script.

Exactly. A more accurate description of what I was looking for would be
"mark this point in the undo stack" and "revert to the marked undo
point". (With an error code if the undo point no longer exists.)

-- David

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