Re: Re: Arabic support

> From: Kenichi Handa <[email protected]>
> Cc: [email protected], [email protected], [email protected]
> 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?