GNU bug report logs - #11484
23.4; Scrolling leaves traces of old text behind

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Packages: emacs, ns;

Reported by: Frank Marcoline <fvmarcoline <at> gmail.com>

Date: Tue, 15 May 2012 22:13:02 UTC

Severity: normal

Found in version 23.4

Done: Jan Djärv <jan.h.d <at> swipnet.se>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Daniel Colascione <dancol <at> dancol.org>
Cc: 11484 <at> debbugs.gnu.org, jan.h.d <at> swipnet.se
Subject: bug#11484: 23.4; Scrolling leaves traces of old text behind
Date: Mon, 22 Oct 2012 19:33:29 +0200

> Date: Sun, 21 Oct 2012 22:11:36 -0700
> From: Daniel Colascione <dancol <at> dancol.org>
> CC: Eli Zaretskii <eliz <at> gnu.org>, 11484 <at> debbugs.gnu.org
> 
> Are displays still slow enough that we have to care about graphics optimization
> at this level?

As Stefan points out, yes, even on X11.

There's also another annoying result of frequent full redrawing:
flickering.  I suspect that disabling this optimization will have the
effect that leaning on the left or right arrow key would cause the
line with the cursor flicker due to constant redrawing.  Similar
problems will show up with the mode line, which is updated quite
frequently.
This bug report was last modified 12 years and 217 days ago.

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