Navigation Circles disappear in Appendix - Beamer - Frankfurt

Question

I am preparing a presentation with beamer using the following preamble:

\documentclass{beamer}

\usepackage{remreset}
\usepackage{comment} % end and begin comment
\usepackage{dtklogos} % for \BibTeX

\makeatletter
\@removefromreset{subsection}{section} % creates navigation circles for every slide not section
\makeatother
\setcounter{subsection}{1} % creates navigation circles for every slide not section

\usetheme{Frankfurt}
\setbeamercovered{transparent}

For every page (note respective lines in preamble) I get a navigation circle in the header of the document. Unfortunately these circles disappear in my quite extensive Appendix. How do I get the circles to also show up in the Appendix (I start the appendix with the \appendix command)?

Answer 1

The problem is that \appendix starts a new \part, which resets the subsection counter (cf. beamerbasesection.sty, l.112). Like this, the mini frames aren't shown anymore in the appendix. To solve the problem, you can prevent the resetting of the counter by patching the internal beamer macro \beamer@part:

\usepackage{etoolbox}
\makeatletter
\patchcmd{\beamer@part}{\setcounter{subsection}{0}}{}{}
\makeatother

A minimal example:

\documentclass{beamer}

\usepackage{remreset}
\usepackage{etoolbox}
\usepackage{comment} % end and begin comment
\usepackage{dtklogos} % for \BibTeX

\makeatletter
\@removefromreset{subsection}{section} % creates navigation circles for every slide not section
\patchcmd{\beamer@part}{\setcounter{subsection}{0}}{}{}
\makeatother
\setcounter{subsection}{1} % creates navigation circles for every slide not section

\usetheme{Frankfurt}
\setbeamercovered{transparent}

\begin{document}
\section{Section 1}
\frame{}\frame{}\frame{}
\section{Section 2}
\frame{}\frame{}
\appendix
\section{Appendix 1}
\frame{}
\section{Appendix 2}
\frame{}\frame{}
\end{document}