[XeTeX] polyglossia overline on a number of lines

[Vafa Khalighi]

>
> I am preparing an edition of an Arabic text, where the main text is separated from the commentary by placing an overline above the former. I am trying to use the \aemph command provided by Polyglossia. However, some of the text which will have such an ovelrine runs for multiple lines. What is resulting is my output is a single long line that runs off the margins of the page, instead of the multiple lines with an overline above the chosen words.
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> Is this a known issue, or am I doing something wrong?
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>
>
You are doing it wrongly because that command puts your text inside an
\hboxR.
-- 
به نام خداوند جان و خرد          کزین برتر اندیشه برنگذرد
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