`gnus-summary-show-article' with prefix arg don't refresh the mode line

[Zhang Wei]

My .gnus contains:

(setq gnus-summary-show-article-charset-alist
      '((1 . utf-8)
        (2 . big5)
        (3 . gbk)
        (4 . utf-7)))

When I say `1 g' `2 g' etc. to force gnus redisplay the article in
specified charset, the article's subject displayed on the mode line
don't refresh, but if I say `2 g'--for example--twice, the mode line
got refreshed the second time.

And I found out if I say `1 g' `2 g' `3 g' `4 g' successively, every
time the `subject' display on the mode line is the `subject' that was
decoded last time.

------------------------------------------------------------
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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
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In GNU Emacs 23.0.0.1 (i686-pc-linux-gnu, GTK+ Version 2.8.20)
 of 2006-10-19 on emacsfans.org
X server distributor `The X.Org Foundation', version 11.0.70000000
configured using `configure '--with-gtk' '--enable-font-backend' 
'--with-freetype' '--with-xft' 'CFLAGS=-g''

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: zh_CN.UTF-8
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  shell-dirtrack-mode: t
  show-paren-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

Recent input:
<return> 1 g 1 g 2 g 2 g C-h k 1 C-g g g C-h k g f 
C-c C-k C-h k g C-x o C-f C-f C-f C-f C-f C-f C-f C-f 
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-S-e C-a 
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f 
C-f C-f C-f C-f C-f C-f C-@ C-e M-w M-x r e p r o t 
- e m <tab> a <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> o r t - e m <tab> 
b u g <tab> <return>

Recent messages:
Quit
Type C-x 4 C-o RET to restore the other window.  
send mail with exim4
>From is `Zhang Wei <address@hidden>', setting `smtpmail-smtp-server' to 
>`message-send-mail-with-sendmail'
Auto-saving...
Mark set
Loading emacsbug...done
Making completion list...
Quit
ibuffer: Cannot switch buffers in minibuffer window

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