emacs i18n bug?

[Eugeny Korekin]

Symptoms:

With locale settings shown below gnus function 
gnus-update-summary-mark-positions doesn't works right
in emacs 21.3.50

----------------------------
(gnus-summary-insert-line
           [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil]
           0 nil t 128 t nil "" nil 1)
          (goto-char (point-min))
          (setq pos (list (cons 'unread (and (search-forward "\200" nil t)
                                             (- (point) (point-min) 1))))
---------------------------


In that piece of code (search-forward "\200" nil t) emacs 21.3 returns 31 (C-_),
while 21.3.50 returns nil.

because of that bug gnus is unable to update summary lines.

gnus with LC_ALL=C emacs works just fine.

In GNU Emacs 21.3.50.6 (i686-pc-linux-gnu)
 of 2003-04-24 on reks
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: ru_RU.KOI8-R
  value of $LC_CTYPE: ru_RU.KOI8-R
  value of $LC_MESSAGES: C
  value of $LC_MONETARY: ru_RU.KOI8-R
  value of $LC_NUMERIC: ru_RU.KOI8-R
  value of $LC_TIME: C
  value of $LANG: ru_RU.KOI8-R
  locale-coding-system: cyrillic-koi8
  default-enable-multibyte-characters: t

Recent input:
<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> <return> <down> 
<up> <return> <up> <return> <up> <return> <up> <return> 
<up> <return> <left> <left> <left> <left> <left> <left> 
<left> <down> <down> <down> <down> <return> <down> 
<return> <up> <return> <down> <return> <up> <return> 
<down> <up> <return> <help-echo> <down-mouse-1> <mouse-1> 
<prior> <prior> <prior> <prior> <prior> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <menu-bar> <help-menu> <re
port-emacs-bug>

Recent messages:
Result: nil [5 times]
Loading apropos...done
Quit [2 times]
Loading mule-diag (compiled; note, source file is newer)...
Loading codepage...done
Loading mule-diag (compiled; note, source file is newer)...done
call-interactively: Beginning of buffer
Loading emacsbug...
Source file `/usr/local/share/emacs/21.3.50/lisp/mail/sendmail.el' newer than 
byte-compiled file
Loading emacsbug...done