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From: "Eli Zaretskii" <eliz@is.elta.co.il>
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Subject: Re: user sees \xxx but is thwarted from searching for them
Date: Tue, 16 Apr 2002 17:07:15 +0300
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> From: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =?iso-8859-1?q?Gro=DFjohann?=)
> Newsgroups: gnu.emacs.bug
> Date: Tue, 16 Apr 2002 13:57:26 +0200
> 
> In Emacs 20.6, the offending characters are highlighted upon C-x C-s.
> Not sure why this fails to happen in 21 from CVS.

Yes, this is a known (and unfortunate) side effect of changes in Mule
between Emacs 20.x and Emacs 21.