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I have noticed that WPF Text Formatter does not show ligature marks in Arabic OpenType fonts correctly, that is when it tries to render a lam+kasra+alef+fatha, for example, it palces both kasra and fatha marks after lamalef ligature.
It seems that WPF does not use Uniscribe and may be the ligature-mark feature of OpenType is not yet implemented in it or I am missing some point.
Please advise me.