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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: i-search face-cache crash
Date: Thu, 27 May 2004 19:54:04 -0400
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    As I mentioned in that thread, the immediate cause of the crash is that
    it's trying to render with a face-id that isn't in the face-id cache.

Can you find where that face id came from?  Maybe we can add
debugging code to detect, earlier, putting the invalid face id
into that place.