Section/subsection not showing in headline in case of right to left text

[seloumi]

I have an issue in showing section and subsection in headline, I use polyglossia to write arabic presentation with beamer.

With texlive 2016 the hedline show properly but with TL 2018 I have no section/ subsection headings in headline :(

Here my file on overleaf with no problems!!

https://www.overleaf.com/16088626pdvzpjbqnndw

\documentclass[dvipsnames,mathserif]{beamer}
\usepackage{polyglossia}
\setdefaultlanguage[numerals=maghrib,numerals=maghrib]{arabic} 
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic]{Amiri}
\newfontfamily\arabicfontsf[Script=Arabic]{Amiri}

\mode<presentation>{\usetheme{Warsaw}}

% for RTL liste
\makeatletter
\newcommand{\RTListe}{\raggedleft\rightskip\leftm}
\newcommand{\leftm}{\@totalleftmargin}
\makeatother



% RTL frame title
\setbeamertemplate{frametitle}
{\vspace*{-1mm}
  \nointerlineskip
    \begin{beamercolorbox}[sep=0.3cm,ht=2.2em,wd=\paperwidth]{frametitle}
        \vbox{}\vskip-2ex%
        \strut\hskip1ex\insertframetitle\strut
        \vskip-0.8ex%
    \end{beamercolorbox}
}

% align subsection in toc
\makeatletter
\setbeamertemplate{subsection in toc}
{\leavevmode\rightskip=5ex%
  \llap{\raise0.1ex\beamer@usesphere{subsection number projected}{bigsphere}\kern1ex}%
  \inserttocsubsection\par%
}
\makeatother

% RTL triangle for itemize
\setbeamertemplate{itemize item}{\scriptsize\raise1.25pt\hbox{\donotcoloroutermaths$\blacktriangleleft$}} 

\defbeamertemplate{enumerate item}{square2}
{\LR{
    %
    \hbox{%
    \usebeamerfont*{item projected}%
    \usebeamercolor[bg]{item projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      {\color{fg}\insertenumlabel}%
      \hfil}%
  }%
}}

\setbeamertemplate{enumerate item}[square2]

\begin{document}

\rightskip\rightmargin

\title{الهندسة الفضائية \\
\textcolor{yellow}{التعامد في الفضاء}}

\author{الأستاذ : سليم}
\institute{المستوى : سنة أولى جذع مشترك علوم وتكنولوجيا}
\date{\today}

\begin{frame}
\maketitle
\end{frame}

\begin{frame}{المحتويات}
\tableofcontents
\end{frame}

\section{تعامد المستقيمات في الفضاء}
\subsection{تعريف}

\begin{frame}{تعامد المستقيمات في الفضاء}

نص بالعربية هنا

\end{frame}

\end{document}

[ghost]

The problem was introduced by the commit 7f21ca3#diff-adb611a8e4bdf2c7a8b624e9c8b7ed4f

As a temporary workaround, place https://raw.githubusercontent.com/josephwright/beamer/795b7ee036d9e1063e76f3b7f4141f743f095807/base/beamerbasecolor.sty in your working folder (this is an old version prior to the changes of the above commit)

[seloumi]

Thanks this work fine, awaiting for a fix with the next release 👍

[josephwright]

@louisstuart96 Would you like to comment here?