[XeTeX] Fontspec Bug

[Heba Soliman]

Dear Mr Will:

First of all thank you for your hard efforts in improving the fontspec 
package.

Second I have a big problem that is related to my work so I need please 
a quick answer.

The problem is that I am writing an arabic article and the diacritics in 
some places are collapsed with the letters and I don't know why this 
problem generated and how to fix it, the only thing I am sure of is that 
the font has no problem as I checked with other programs as Adobe 
illustrator and this problem doesn't exist:

This is my sample file:

\documentclass{amsart}

\usepackage{fontspec}
\usepackage{xltxtra}
\usepackage{xunicode}
\usepackage{bidi}


\setmainfont[Script=Arabic]{YakoutLinotypeLight-Regularxx.ttf}

\begin{document}

لمّا ألّا لمًّا آلّلًة لمُا

\end{document}

Please find attached the generated PDF file.

I will appreciate your quick reply. Thank you again for your efforts.

Best regards,

Heba
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