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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: The *Warnings* buffer and undo
Date: Fri, 30 Mar 2007 08:42:25 -0400
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Xref: news.gmane.org gmane.emacs.devel:68791

    Unrecorded changes turn the existing undo history useless.  While it
    could conceivably be nice if user changes could be undone, this won't
    work out.  The best that a program could do in this regard is set
    buffer-undo-list to t before doing its changes, and to nil afterwards.

That sounds like a good solution -- better than suppressing undo 100%
in that buffer.