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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: jit-lock doesn't honor font-lock-lines-before
Date: Fri, 02 Sep 2005 02:05:53 -0400
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Xref: news.gmane.org gmane.emacs.devel:42573
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    I suggest the patch below, which also sets the default value to 0: except
    for some special modes which rely on font-lock-lines-before (and which
    should thus set it explicitly to an appropriate value), setting it to
    something more than 0 will just waste CPU.

If you change the default to 0, would you please modify C mode
to set it to 1?