GNU bug report logs - #148
[Bernardo Dal Seno]: scroll-margin and scroll-preserve-screen-position cause refresh problem

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Message #15 received at 148 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Sven Joachim <svenjoac <at> gmx.de>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 148 <at> debbugs.gnu.org
Subject: Re: bug#148: [Bernardo Dal Seno]: scroll-margin and scroll-preserve-screen-position cause refresh problem
Date: Sun, 20 Apr 2008 15:57:18 +0200

On 2008-04-19 16:20 +0200, Stefan Monnier wrote:

> This behavior is not a bug in itself, it's just a symptom: it means that
> redisplay was interrupted by user input before it had time
> to terminate.  See redisplay-dont-pause.

Okay, maybe the submitter of the Debian bug should set
redisplay-dont-pause to t to work around the problem.

> So, the problem you're reporting is that Emacs's redisplay is too slow
> to keep up with the scrolling (which is indeed a problem).  This may of
> course depend on the file's content and the major-mode (since part of the
> redisplay time might be used by font-locking, for example).

Do you have an explanation why the combination of

(setq scroll-margin 2)
(setq scroll-preserve-screen-position)

slows down redisplay so much on C-v, especially if point is in the
middle of the window?  I've never seen the problem in the default
settings.

Sven

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