GNU bug report logs - #28339
25.2; Emacs shows ZWNJ character (Zero Width non-Joiner) as Space

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Message #104 received at 28339 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: handa <handa <at> gnu.org>
Cc: b.riefenstahl <at> turtle-trading.net, nimawebgard <at> gmail.com,
 28339 <at> debbugs.gnu.org
Subject: Re: bug#28339: 25.2;
 Emacs shows ZWNJ character (Zero Width non-Joiner) as Space
Date: Wed, 20 Sep 2017 10:25:57 +0300

> From: handa <handa <at> gnu.org>
> Cc: b.riefenstahl <at> turtle-trading.net, nimawebgard <at> gmail.com,
> 	28339 <at> debbugs.gnu.org
> Date: Tue, 19 Sep 2017 21:18:31 +0900
> 
> In article <83h8w0hwa7.fsf <at> gnu.org>, Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > I don't see this in Unicode, but maybe I'm missing something.
> 
> > Anyway, what would you suggest as a solution to this issue?  Should we
> > install the arabic-font-shape-gstring function into Emacs?  Do we need
> > to do something else in addition?  E.g., do we need to make the
> > display of ZWNJ optional?
> 
> As I don't know what is the right thing, I'm asking here.
> 
> If users never ever want to put cursor on ZWNJ,
> arabic-font-shape-gstring-ZWNJ-absorb is the solution.
> 
> If users want a thin space to be able to handle ZWNJ directly,
> arabic-font-shape-gstring-ZWNJ-as-space is the solution.
> 
> If it depends on a situation or a user's prefernce, it is better to have
> a user customizable variable to switch between them.

Maybe we should go with an option.  I will try to come up with a patch
for that.

> By the way, I've just tried arabic-shape.el on Windows, and found that
> arabic-font-shape-gstring-ZWNJ-as-space worked, which means Windows text
> laout backend on Windows (uniscribe?) also returns ZWNJ glyph.

Yes, it does.

> And, without arabic-font-shape-gstring-ZWNJ-as-space, I see a
> strange cursor display.  Is it the "glitch" you mentioned?

Yes.  Do you understand what is the reason for that?

Thanks.

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