[XeTeX] polyglossia bug?

[Ulrike Fischer]

The following document gives with polyglossia.sty    2009/11/20
v1.1.0 this error:

! Extra }, or forgotten \endgroup.
\@begin at tempboxa ...begingroup #2\color at endgroup }
                                                  \def \width {\wd
\@tempbox...
l.28 \newpage


The error disappeasr if I remove one level of braces around
\protect\@@ensure at maindir{#3} from the \@markright definition. 


\listfiles
\documentclass{book}
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}
\lhead{\leftmark,\rightmark}
\usepackage
    {polyglossia}
\setmainlanguage[spelling=new, latesthyphen=true]{german}

\begin{document}
\makeatletter
%changed definition (one level of braces less)  
% \def\@markright#1#2#3{\@temptokena{\protect\@@ensure at maindir{#1}}%
%  \unrestored at protected@xdef\@themark{{\the\@temptokena}%
%   {\protect\@@ensure at maindir{#3}}}}
               

\chapter{A}
\section{a}
Dies ist ein Test.
\newpage
\section{b}
Dies ist ein Test.
\newpage
\section{c}

\end{document}


-- 
Ulrike Fischer