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From: Richard Stallman <rms@gnu.org>
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Subject: Re: rectangle operations - narrowing?
Date: Sun, 09 Jul 2006 10:12:40 -0400
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Xref: news.gmane.org gmane.emacs.devel:56848
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/56848>

    What I'd like to do, to start with, is, in effect, "narrow" to a region that
    has the content of a given rectangle of text. The idea would be to operate
    on this region in some way, and then widen again - in effect putting the
    (possibly modified) rectangle back in context.

Ordinary narrowing limits what redisplay includes.  But I think you
would want this new rectangle narrowing to have no effect on redisplay.
Right?