[XeTeX] xetex and pstricks-add

[HAF MED]

HELLO ;

I have remarked that a example in doc of pstricks-add don't works well with
xetex.

\documentclass{article}
\usepackage{pstricks-add}
\usepackage{fontspec}

\begin{document}
\begin{pspicture}(\linewidth,5)
\psbrace(0,0.5)(\linewidth,0.5){\fbox{Text}}%
\psbrace[bracePos=0.25,nodesepB=10pt,rot=90](0,2)(\linewidth,2){\fbox{Text}}
\psbrace[ref=lC,nodesepA=-3.5cm,nodesepB=15pt,rot=90](0,4)(\linewidth,4){%
\fbox{some very, very long wonderful Text}}
\end{pspicture}
\end{document}

the texte in the laste brace is not *vertical*

is the probleme in xetex or in the package pstricks-add
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