'calt' tables aren't applied if with combining marks, though
IgnoreMarks flag is set.
--
Khaled Hosny
Arabic localizer and member of Arabeyes.org team
% engine=luatex
\ctxlua { fonts.color.trace = true }
\definefontfeature
[arab]
[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,calt=yes,
kern=yes,curs=yes]
\font\Arabic = arabtype*arab at 100pt
\starttext
\startTEXpage \relax \setupcolors[state=start]%
\textdir TRT\pardir TRT\Arabic
\ تثت تَثْتَ \crlf
\stopTEXpage
\stoptext
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