Hi Seyal,

See below:

------ Original Message ------
From "Hans Hagen" <j.hagen@xs4all.nl>
To "seyal.zavira@gmail.com" <seyal.zavira@gmail.com>; "mailing list for ConTeXt users" <ntg-context@ntg.nl>
Date 5/9/2024 3:31:45 AM
Subject [NTG-context] Re: rendering arabic diacritics

** Caution: EXTERNAL Sender **
 
On 5/9/2024 10:03 AM, seyal.zavira@gmail.com wrote:
Hi all,
 
when i want to use the linked font for arabic texts it doesn't render diacritics properly
i doesn't have problem with this font in inkscape or libreoffice
what featureset should i apply?
 
font link:
 
this is my MWE:
\definefontfeature [arabis]
[mode=node,language=dflt,script=arab,
init=yes,medi=yes,fina=yes,isol=yes,
liga=yes,dlig=yes,rlig=yes,clig=yes,
mark=yes,mkmk=yes,kern=yes,curs=yes]
\definefont [Ahang] [file:Ahang-Regular.otf*arabis at 18pt]
\setupalign[r2l]
\starttext
{\Ahang تَشْكِيل كَسْرَة}
\stoptext
 
\definefont [Ahang] [file:Ahang-Regular.otf*arabic at 18pt]
 
but there is an issue with widths, ill send you a patch to test

The provided "*arabic" featureset should suffice for this font. Also TEXpage is useful for this kind of MWE:

\definefont [Ahang] [file:Ahang-Regular.otf*arabic at 18pt]
\setupalign[r2l]
\startTEXpage[offset=1em]
{\Ahang تَشْكِيل  كَسْرَة}
\stopTEXpage

In prehistoric ConTeXt version 

   2023.09.26 18:19 

the diacritics look fine in both ConTeXt and unicode editor MS Notepad.

So if there is something wrong, it must be in a more recent version. 

For comparison: Before applying Hans' patch, could you kindly send your pdf of the MWE that shows the error? Mine is attached.

Best wishes
Idris
--
Idris Samawi Hamid, Professor
Department of Philosophy
Colorado State University
Fort Collins, CO 80523