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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Fwd: Re: junk in *grep* buffers
Date: Tue, 10 May 2005 12:26:01 -0400
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    The following hack fixes the problem, but this is an imperfect solution.
    It sets the local variable `pos' from `font-lock-fontify-keywords-region'
    to avoid changing the current position on the line:

Could the code in font-lock-fontify-keywords-region use a marker to
maintain that position?  Then it would be relocated automatically.