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From: Richard Stallman <rms@gnu.org>
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Subject: Re: New undo element (fun . args)
Date: Wed, 02 Feb 2005 02:28:17 -0500
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    I don't know, but in the case of ses, it may not make sense to have
    undo in a region, and consequently may be quite hard to put something
    sensible into DELTA, BEG and END.

One of the undoable operations in SES is setting a variable.
This doesn't relate directly to buffer text, but it might
be associated with some region somehow.  I don't know
how this is used, and I think it is important to check.

Could someone check?

I sent another message asking Yavner to help with this.