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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: fill-paragrapch set the buffer to changed when there is none
Date: Fri, 07 Jul 2006 00:14:10 -0400
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    Would it be possible to just set the modified flag correctly? Can the 
    undo list be truncated?

It might work to fix up the data that way, if it can determine that
the text isn't really changed.  Determining that may not be trivial,
though.