GNU bug report logs - #66503
29.1; Problem rendering Arabic diacriticals

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From: Eli Zaretskii <eliz <at> gnu.org>
To: John Wiegley <johnw <at> gnu.org>
Cc: 66503 <at> debbugs.gnu.org
Subject: bug#66503: 29.1; Problem rendering Arabic diacriticals
Date: Sat, 14 Oct 2023 09:57:48 +0300

> From: John Wiegley <johnw <at> gnu.org>
> Cc: bug-gnu-emacs <at> gnu.org
> Date: Fri, 13 Oct 2023 22:19:52 -0700
> 
> I have found a workaround: By typing “shadda followed by fatha” instead of
> “fatha followed by shadda”, my Emacs renders it correctly. Here are the two
> different lines:
> 
> لَنَهْدِيَنَّهُمْ
> لَنَهْدِيَنَّهُمْ
> 
> In Mellel these are both rendered the same, but (my) Emacs treats them quite
> differently.

Both lines render identically here.  I think the conclusion is that
the macOS text-shaping engine doesn't sort the combining characters
before rendering them, which is what shaping engines are expected to
do.  However, I don't consider myself an expert on this, so maybe
raise this issue on some forum where the development of the macOS
shaper is discussed?

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