Arabic font : "Mark" problem with Ligatures.
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ahmederaqi
Posts: 20
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You need to set the process marks flag in the ligature lookup to not process any marks, then the substitution will ignore the presence of any marks.
Another method would be to not treat the lam+alif as a ligature glyph, but instead as contextual variants, which would be particularly easy with the shape you are using. To do this, you would cut your ligature into two pieces, and then contextually change alif shape when it follows the lam.0
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