[XeTeX] Position of kasra when used together with tashdid in Arabic

[Andy Lin]

> The best thing is to try a font which does not have this kind of issue.

I've attached a pdf file of various Arabic fonts (most of them are
included with newer versions of Windows). The string is input with
tashdid before kasra. The first column has the script set to Arabic,
the second column has the language set to Urdu (the SIL fonts behave
differently here!), and the third has the language set to Farsi.

Hope this helps,
Andy
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