Parts broken in TOC with Polyglossia / French

Question

I'm trying to remove "Première Partie" from the TOC, I just would like the part title. It works well if I remove polyglossia, but I need it for Asian languages in my document.

Minimal example:

\documentclass[11pt,openany]{memoir}
\usepackage{polyglossia}
\setdefaultlanguage{french}

\begin{document}

\tableofcontents

\part{Le début}

Salut

\end{document}

And the output (with xelatex):

I know that polyglossia/French is messing up with \thepart, but the solution is beyond my latex level!

Answer 1

The typesetting of part titles in the table of contents uses \partnumberlinebox, which is defined to typeset its contents in a box with fixed width. You can redefine to take all the space it needs. I added an em-dash for separation.

\documentclass[11pt,openany]{memoir}
\usepackage{polyglossia}
\setdefaultlanguage{french}

\setheadfoot{14.4pt}{\footskip} % remove the warning

% fix the typesetting of the part number
\renewcommand\partnumberlinebox[2]{#2\ ---\ }

\begin{document}

\tableofcontents

\part{Le début}

Salut

\end{document}