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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Idle timers with the active minibuffer
Date: Fri, 09 Nov 2007 17:00:07 -0500
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Xref: news.gmane.org gmane.emacs.devel:82887
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	    * keyboard.c (command_loop_1): Handle non-number values of
	    `minibuffer-message-timeout'.

That change seems to be needed for this:

	;; Save the original value of `minibuffer-message-timeout', and
	;; set it to nil so that isearch's messages don't get timed out.
	isearch-original-minibuffer-message-timeout minibuffer-message-timeout
	minibuffer-message-timeout nil)

Without the change in keyboard.c, won't sit_for crash
given nil as an argument?