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Re: redisplay-dont-pause

From: Eli Zaretskii
Subject: Re: redisplay-dont-pause
Date: Fri, 16 Sep 2011 20:45:15 +0300

> Date: Fri, 16 Sep 2011 13:29:42 -0400
> From: Richard Stallman <address@hidden>
> CC: address@hidden
>     Because the optimizations rely on the display being up to date, which
>     cannot be assured if redisplay was aborted half way through.
> There is no reason in principle that it can't be assured.
> The display code I wrote assured the integrity of the records,
> even when it stopped having updated only some of the lines.
> And the multi-font display code in Emacs 19 did so too.

Perhaps if you describe the design of how the old display engine kept
records about up-to-dateness of display portions, we could see if the
same design principles can be used with the current display engine,
and maybe implement such a feature.

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