Re: [BUG]What does this mean:"Mention that multibyte characters

[Katsumi Yamaoka <yamaoka@jpl.org>]

>>>>> In <b9yacuji7t6.fsf@jpl.org> Katsumi Yamaoka wrote:

>>>>>> In <m2pt3ryt2b.fsf@yahoo.com.cn>
>>>>>>	zrr <beijing_2008_gold@yahoo.com.cn> wrote:

>>    I pressed 'E' to expire the artile, but the article still be
>>    regarded as not expired.  There is no mark symbol appeared and no
>>    highlight on the current line.

> I've fixed it in both the Gnus trunk and the v5-10 branch.  It
> will help not only Emacs 22 users but also Russian users,
> Ukrainian users and much more.

Kenichi Handa suggested there is potentially another problem.
It existed, even before I modified gnus-sum.el.

In order to know column positions of summary lines where marks
should be inserted, Gnus makes a dummy summary line.  There four
characters which correspond to the data \200, \201, \202 and
\203 are used as dummy marks, and Gnus look for them.  See the
gnus-update-summary-mark-positions function:

    (let ((gnus-replied-mark 129)
	  (gnus-score-below-mark 130)
	  (gnus-score-over-mark 130)
	  (gnus-undownloaded-mark 131)

Although those characters will never be printable in the Latin-1
language environment and so forth, they might be usually being
used in the Russian language environment, for example.  So, it
is possible that gnus-summary-line-format contains them and
gnus-user-format-function-* may return them.  In those cases,
Gnus will recognize incorrect mark positions.  You can try it
using the following way:

(set-language-environment 'Russian)
(setq gnus-summary-line-format
      (concat (string-make-multibyte "\200\201\202\203")
	      "%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n")
(gnus-update-format-specifications t 'summary)

He hinted using \0, \1, etc. instead.  However, I'm not sure of
whether they don't bring about damage.  For the moment, I'm
planning to replace \200, \201, etc. to just space, if
gnus-summary-line-format contains them or
gnus-user-format-function-* returns them.

Is it unnecessary worries? ;-)