[XeTeX] misplaced combining diacritical marks

[Yves Codet]

Hello.

I noticed a small problem which Jonathan might want to examine (hoping 
we don't all harass him too much).

With "Lucida Grande" acute and circumflex are correctly placed over a 
macron in TextEdit (image 1, in the transcription of Greek for'a and 
for~as), but not in the pdf produced by XeLaTeX (image 2), where they 
are superimposed to the macron.

Kind regards,

Yves

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