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bug#15957: 24.3.50; Follow mode scrolling broken on Emacs trunk


From: Anders Lindgren
Subject: bug#15957: 24.3.50; Follow mode scrolling broken on Emacs trunk
Date: Fri, 22 Nov 2013 23:23:37 +0100

Hi!

Scrolling multiple pages when Follow mode is enabled sometimes fails.

Steps to repeat:

    Emacs -Q
    C-h t
    ESC : (set-frame-size (selected-frame) 200 70) RET
    M-x follow-delete-other-windows-and-split RET
    C-c . C-v

The intent is to scroll the entire document two pages down, the left
window should still be selected (this causes Follow mode to arrange the
right window after it). Instead, the right window is selected, which causes
the left to be arranged after it, effectively undoing the scroll.

The problem seems to be sometimes intermittent, sometimes the scroll works,
sometimes it don't.

An interesting effect is that the problem only occurs when
follow-scroll-up is bound to a key. When issuing M-x follow-scroll-up
RET, the command seems to be working properly.

By the way, I'm the original author of Follow mode, even tough I haven't
touched it for many years.

Sincerely,
    Anders Lindgren


In GNU Emacs 24.3.50.11 (x86_64-apple-darwin13.0.0, NS apple-appkit-1265.00)
 of 2013-11-21 on macpro.lan
Bzr revision: 115156 address@hidden
Windowing system distributor `Apple', version 10.3.1265
Configured using:
 `configure --with-ns'

Important settings:
  value of $LC_CTYPE: UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  follow-mode: t
  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
  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:
<help-echo> C-x C-g C-h t x C-x u <escape> x f o l 
l o w - d e <tab> <return> C-c . C-v <escape> x r e 
p o r t - b <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
C-x C-g is undefined
Preparing tutorial ...
Undo!

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils follow tutorial help-mode easymenu time-date
tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
cocoa ns multi-tty emacs)


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