Hello,
I confirm this is a polyglossia issue. With babel, everything works as it
should:
\documentclass[10pt]{beamer}
\usepackage[polish,francais]{babel}
\usepackage{xltxtra}
\usepackage{fontspec}
\usepackage{hyperref}
\usefonttheme[stillsansseriflarge]{serif}
\setmainfont[BoldFont={Apolonia-Bold},Ligatures=Contextual,Contextuals=Swash]{Apolonia}
\setmonofont{DroidSansMono}
\setsansfont[Ligatures=Contextual,Contextuals=Swash]{Apolonia Nova OT}
\newfontfamily\dejavusans[Ligatures=Required]{DejaVuSans}
\newfontfamily\dejavuserif[Ligatures=Required]{DejaVuSerifCondensed}
\begin{document}
some sentences
\end{document}
did exactly behave as I expected. So I'll switch to babel for a few days.
PS: I looked at beamer sources, but wasn't able to find some usefull infos
about this bug. Maybe this is connected to \usebeamerfont macro?
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