[XeTeX] arabic problem with polyglossia

[Youssef]

Hi everyone,

I'm a bit confused by the way polyglossia has been handling Arabic.
I've tried to use arabxetex as a substitute, but to no avail.

The main problem with polyglossia is that it messes up Arabic (utf) 
inside \section{} and \chapter{}.

I'm sending a minimal example attached together with the resulting pdf 
and log.

Any help would be much appreciated.




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