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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Multiple regions
Date: Mon, 16 Jan 2012 08:34:05 -0500
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To: Tom <adatgyujto@gmail.com>
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> From: Tom <adatgyujto@gmail.com>
> Date: Mon, 16 Jan 2012 13:01:07 +0000 (UTC)
> 
> Native support for multiple regions could also support narrowing
> the buffer to multiple non-contiguous regions

Narrowing and region are implemented in two entirely separate and
unrelated parts of Emacs internals.  The latter is tightly coupled
with the display engine, the former is unrelated to display.  So you
can have one without the other and vice versa.