Subject: Re: bug#148: [Bernardo Dal Seno]: scroll-margin and scroll-preserve-screen-position cause refresh problem

From: Stefan Monnier <[email-masked]>
Date: Sat, 19 Apr 2008 10:20:51 -0400

> I received the attached message via the Debian bug tracking system.  The
> described redisplay problem is reproducible in both EMACS_22_BASE and
> the trunk.  While the scrollbar and the modeline are updated upon C-v,
> the buffer window is not.

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.

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).

        Stefan