GNU bug report logs - #546
scroll-margin not respected for downward scrolling when show-trailing-whitespace is t

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Greg Falcon <gfalcon <at> itasoftware.com>
To: bug-gnu-emacs <at> gnu.org
Subject: scroll-margin not respected for downward scrolling when show-trailing-whitespace
 is t
Date: Thu, 10 Jul 2008 11:35:42 -0400

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs <at> gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


When show-trailing-whitespace is on, the scroll-margin feature doesn't 
work when approaching the bottom of a window (though it does work for 
the top of a window).  Setting show-trailing-whitespace to nil makes the 
problem go away.


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/22.2/etc/DEBUG for instructions.


In GNU Emacs 22.2.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-07-10 on deng-gfalc
Windowing system distributor `The X.Org Foundation', version 11.0.60801000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
<down> <down> <down> <down> <down> <down> <down> <down>
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<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
M-x C-g <escape> : ( s e t q SPC s c r o l l - m a
r g i n SPC 5 ) <return> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> M-x r e p <tab> o <tab> r <tab> <re
turn>

Recent messages:
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Making completion list...
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Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: bojohan+news <at> dd.chalmers.se (Johan Bockgård)
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#546: scroll-margin not respected for downward scrolling when show-trailing-whitespace is t
Date: Sat, 12 Jul 2008 18:17:38 +0200

Greg Falcon <gfalcon <at> itasoftware.com> writes:

> When show-trailing-whitespace is on, the scroll-margin feature doesn't
> work when approaching the bottom of a window (though it does work for
> the top of a window). Setting show-trailing-whitespace to nil makes
> the problem go away.

(This was also reported a few months back,
http://lists.gnu.org/archive/html/bug-gnu-emacs/2008-03/msg00019.html)

It used to not work for the top as well as for the bottom margins. That
bug was fixed three years ago,

http://lists.gnu.org/archive/html/emacs-devel/2005-06/msg01561.html

  2005-06-25  Richard M. Stallman  <rms <at> gnu.org>

          * macfns.c (Fx_show_tip): Pass new arg to try_window.

          * w32fns.c (Fx_show_tip): Pass new arg to try_window.

          * xfns.c (Fx_show_tip): Pass new arg to try_window.

          * xdisp.c (try_window): New arg CHECK_MARGINS.  Calls changed.
          (redisplay_window): Handle try_window reporting point in scroll
          margin.

          * dispextern.h (try_window): Declare new arg.


It seems it was broken again (for the bottom margin) a week later,

http://lists.gnu.org/archive/html/emacs-devel/2005-07/msg00244.html

  2005-07-03  Richard M. Stallman  <rms <at> gnu.org>

          * xdisp.c (try_window): Fix previous change in how it handles
          a partially-visible line or one only partly past the margin.

          * window.c (window_scroll_pixel_based): Take account
          of this_scroll_margin when finding point when scrolling up.

-- 
Johan Bockgård

Message #17 received at 546-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Greg Falcon <gfalcon <at> itasoftware.com>, Andy Grover <andy <at> groveronline.com>
Cc: 546-done <at> debbugs.gnu.org
Subject: Re: inconsistent behavior with scroll-margin and scroll-conservatively
Date: Wed, 06 Aug 2008 14:29:23 -0400

I've just checked in fixes to Emacs' display engine that should solve
the problems with scroll-margin.  These fixes are not safe enough for
Emacs 22, but they'll be present in Emacs 23 (current CVS trunk).

Thanks for the bug reports.

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