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From: Chong Yidong <cyd@stupidchicken.com>
Newsgroups: gmane.emacs.devel,gmane.emacs.help
Subject: Re: help about the display iterator.
Date: Fri, 16 Jan 2009 10:21:37 -0500
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"A. Soare" <alinsoar@voila.fr> writes:

> However, I do not understand the mechanism from `redisplay_ineternal'
> (I have the impression that it's this function that creates the
> desired_matrix of glyphs) and refresh the display.

You'll have to be more specific in asking these sorts of questions, I'm
afraid.  Have you looked at the commentary at the beginning of xdisp.c?