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bug#8195: 24.0.50; 24.0.50; Strange buffer recentering behavior on M-x,

From: Andreas Rottmann
Subject: bug#8195: 24.0.50; 24.0.50; Strange buffer recentering behavior on M-x, apparently recently introduced
Date: Mon, 07 Mar 2011 16:58:50 +0100

Start "emacs -Q" from bzr (I'm using the git mirror, most recent commit
is from Sun Mar 6 02:53:51 2011 -0800 by Paul Eggert, message "Merge:
current_column: ...").  Open a longish text file; etc/CONTRIBUTE from
Emacs source will do.  Navigate down the buffer so that point is on the
last visible line (and you still have a few screenfuls of text below
point).  Now hit "M-x".  The effect is that the text shown in the
buffer's window is changed so that the point position is centered
vertically in that window.

Until recently, this would not have any recentering effect.  It seems
that scrolling in general is behaving strangely (text shown in the
windows changing randomly) recently, but the above steps seem to always
reproduce to what I deem buggy behavior.

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1)
 of 2011-03-07 on delenn
Windowing system distributor `The X.Org Foundation', version 11.0.10904000
configured using `configure  '--prefix=/home/rotty/.system/stow/emacs''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: de_AT.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x RET r e p o <backspace> C-g M-x r e p o r t - e 
m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

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