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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [R.Ekker@ai.rug.nl: highlight-changes-rotate-faces sets buffer
 modified flag]
Date: Fri, 11 May 2007 03:44:02 -0400
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To: martin rudalics <rudalics@gmx.at>
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Xref: news.gmane.org gmane.emacs.devel:70788
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     > Should it use something the font-lock mechanism so that it can update
     > when the buffer is edited?

    Hmmm ... it does so, in principle, but for the reliance on the undo
    mechanism.

I don't understand that -- can you explain?