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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Bug in font-lock/grep interaction
Date: Thu, 14 Oct 2010 12:02:53 -0400
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Lars Magne Ingebrigtsen wrote:

> If you have
>
> (setq font-lock-global-modes nil)

Why would you do that, as opposed to

(global-font-lock-mode -1)

> then grep won't work:

I think grep requires font-lock to be on to work, so it should
probably override/ignore font-lock-global-modes. See

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=801
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2134

PS: It is better to report bugs to the bug list.