bug#873: marked as done (Annoying recentering when scrolling down)

[don@donarmstrong.com (Emacs bug Tracking System)]

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Your message dated Mon, 27 Oct 2008 01:19:00 -0400
with message-id <87d4hm4nuj.fsf@cyd.mit.edu>
and subject line Re: Recentering on scroll
has caused the Emacs bug report #873,
regarding Annoying recentering when scrolling down
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
873: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=873
Emacs Bug Tracking System
Contact don@donarmstrong.com with problems

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From: "Juanma Barranquero" <lekktu@gmail.com>
To: "Emacs Bug Tracker" <submit@emacsbugs.donarmstrong.com>
Subject: Annoying recentering when scrolling down
Date: Wed, 3 Sep 2008 18:15:14 +0200
Message-ID: <f7ccd24b0809030915w1a667fc9k6ce0d656c29b1257@mail.gmail.com>

Package: emacs
Version: 23.0.60
Severity: normal

After setting this in .emacs:

(setq scroll-preserve-screen-position 'always
      scroll-conservatively           most-positive-fixnum ;; any large number
      scroll-step                     0)

scroll-down causes recentering. This is a regression.

The bug was apparently introduced by the following change:

2008-08-06  Chong Yidong  <address@hidden>

        * xdisp.c (try_scrolling): Use iterator to find the scroll margin,
        instead of window-end which does the wrong thing at eob.
        (try_cursor_movement): Minor optimization.
        (redisplay_window): If scroll margin is defined, don't assume
        window doesn't need scrolling.


emacs-devel discussion:

http://lists.gnu.org/archive/html/emacs-devel/2008-08/msg00903.html



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From: Chong Yidong <cyd@stupidchicken.com>
To: "Juanma Barranquero" <lekktu@gmail.com>
Cc: emacs-devel@gnu.org, 873-done@emacsbugs.donarmstrong.com
Subject: Re: Recentering on scroll
Date: Mon, 27 Oct 2008 01:19:00 -0400
Message-ID: <87d4hm4nuj.fsf@cyd.mit.edu>

"Juanma Barranquero" <lekktu@gmail.com> writes:

> On Sat, Oct 25, 2008 at 19:03, Chong Yidong <cyd@stupidchicken.com> wrote:
>
>> Can anyone reproduce bug#873 (occasional recentering during C-n)?  I
>
> I can still reproduce it on Windows, though the effect's frequency
> varies with frame size and font (it seems to happen more often with
> DejaVu Sans Mono than Courier New, for example).

I managed to reproduce it, and found the bug that (I think) was causing
this problem.  I've checked in a fix.