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From: Joe Corneli <jcorneli@math.utexas.edu>
Newsgroups: gmane.emacs.help
Subject: Re: Horizontal Scroll (mode-line)
Date: Thu, 02 Jun 2005 14:55:49 -0500
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Presumably you can get the modestring to pop up in a temporary buffer.
You might look at the variable mode-line-format and go from there.
I'm not sure what code is used to parse the mode-line-format into the
string you see in the modeline.