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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bidi,gmane.emacs.devel
Subject: Re: Re: Arabic support
Date: Wed, 01 Sep 2010 00:58:59 -0400
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To: Kenichi Handa <handa@m17n.org>
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In-reply-to: <tl7mxs218b9.fsf@m17n.org> (message from Kenichi Handa on Wed, 01
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> From: Kenichi Handa <handa@m17n.org>
> Cc: eliz@gnu.org, emacs-bidi@gnu.org, emacs-devel@gnu.org
> Date: Wed, 01 Sep 2010 11:55:38 +0900
> 
> In Emacs, the column number affects when a user types C-n
> (or C-p) to go to (roughly) the same x-position of the next
> (or previous) line.  So, the column number should reflects
> the x-position, and for that, zero-width combining
> characters should not be counted into the column number.

But does the implementation of current-column, move-to-column and
friends support that?  Perhaps I'm missing something, but my reading
of current_column_1 and its subroutines is that it only supports
display strings, composed characters, and display tables.  Do
zero-width characters use any of these mechanisms?