[XeTeX] Khmer font problem

[Vadim Radionov]

Dear list members,

I'm working on a Khmer dictionary (lacking any knowledge of the script and
language) and there are some problems with compound characters.

For example:

\documentclass{book}
\usepackage{polyglossia}
\newfontface\khmerfont[Script=Khmer]{Khmer OS System}
\begin{document}
\khmerfont មហាសង្រ្កាន្ត
\end{document}

The second to last group is displayed correctly in my browser and in Emacs
(which uses, as far as i can see, the mentioned font), but after processing
it with xelatex it splits into several components.

What can be done?

Best regards,
Vadim
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