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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Buffer-local faces
Date: Wed, 05 May 2004 16:20:21 -0400
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    Seriously, tho, the problem is not signal handlers (those are fixed
    by -DSYNC_INPUT or by BLOCK_INPUT), but execution of Lisp code from within
    the display engine (which can lead to crashes if the Lisp code modifies the
    current buffer or does other such funny things).

Execution of Lisp code within display is legitimate nowadays.
So if a specific case causes trouble, we need to debug it.