[XeTeX] Coptic typesetting backwards with polyglossia

[Jonathan Harmon]

I was so pleased that the polyglossia package started supporting more
languages, including Coptic. But when I try to invoke it with \textcoptic{}
or the coptic environment, it typesets right-to-left, i.e. backwards.
Interestingly, the problem doesn't seem to exist if \textcoptic{} is not
invoked. Is there a reason for this, or was there a step I missed?

Here is the text of the example file:

\documentclass{article}
\usepackage{fontspec,xunicode,xltxtra}

\usepackage{polyglossia}

\setmainlanguage{english}

\setotherlanguage{coptic}

\setmainfont{Antinoou}

\newfontfamily\copticfont{Antinoou}

\begin{document}

Here is some English text.

\bigskip

And now for the Coptic:

ⲛⲁⲉⲓ ⲛⲉ ⲛ̅ϣⲁϫⲉ ⲉⲑⲏⲡ ⲉⲛⲧ-ⲁ-ⲓ̅ⲥ̅

\textcoptic{ⲛⲁⲉⲓ ⲛⲉ ⲛ̅ϣⲁϫⲉ ⲉⲑⲏⲡ ⲉⲛⲧ-ⲁ-ⲓ̅ⲥ̅}

\begin{coptic}

ⲛⲁⲉⲓ ⲛⲉ ⲛ̅ϣⲁϫⲉ ⲉⲑⲏⲡ ⲉⲛⲧ-ⲁ-ⲓ̅ⲥ̅

\end{coptic}

\end{document}
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