bug#8468: 24.0.50; No redisplay after C-h i when scroll-margin is set

[Ralf Angeli]

If you start Emacs with

emacs -Q --eval '(setq scroll-margin 1)'

and type `C-h i' the window contents will not be updated, i.e. you will
look at the *scratch* buffer until you type `C-l'.  I see this behavior
as well when composing follow-up messages in Gnus.

This happens with a checkout done today.


In GNU Emacs 24.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.3)
 of 2011-04-10 on photon
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
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
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Info

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-h i C-l 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.
Composing main Info directory...done

Load-path shadows:
/usr/local/share/emacs/site-lisp/reftex/reftex-vars hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-vars
/usr/local/share/emacs/site-lisp/reftex/reftex-dcr hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-dcr
/usr/local/share/emacs/site-lisp/reftex/reftex-ref hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-ref
/usr/local/share/emacs/site-lisp/reftex/reftex-parse hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-parse
/usr/local/share/emacs/site-lisp/reftex/reftex-index hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-index
/usr/local/share/emacs/site-lisp/reftex/reftex-auc hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-auc
/usr/local/share/emacs/site-lisp/reftex/reftex hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex
/usr/local/share/emacs/site-lisp/reftex/reftex-cite hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-cite
/usr/local/share/emacs/site-lisp/reftex/reftex-global hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-global
/usr/local/share/emacs/site-lisp/reftex/reftex-sel hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-sel
/usr/local/share/emacs/site-lisp/reftex/reftex-toc hides 
/usr/local/share/emacs/24.0.50/lisp/textmodes/reftex-toc

Features:
(shadow sort mail-extr message sendmail regexp-opt format-spec rfc822
mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 ietf-drums mailabbrev mail-utils gmm-utils mailheader emacsbug
url-util url-parse auth-source eieio byte-opt bytecomp byte-compile
cconv macroexp assoc gnus-util time-date password-cache url-vars mm-util
mail-prsvr info easymenu tooltip ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-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 loaddefs
button faces cus-face files text-properties overlay md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)