\input regression-test
\DocumentMetadata{}
\documentclass[standalone,doctype=slides,profile=ltx-talk]{osglecture}
\usepackage{ltxtalk-theme-tuc-2019}
\useltxtalktheme{tuc-2019}
\course[Kurz]{Echtzeitsysteme}
\title{Falten und Schneiden}
\author{A. Beispiel}
\ExplSyntaxOn
\settucthemeheader{teaching}
\ExplSyntaxOff

\begin{document}
\START
\OsgLectureDeploymentChapter{3}
\lecture[Falten]{Falten und Schneiden}{falten-schneiden}

\ExplSyntaxOn
\str_if_eq:eeTF { \__ltxtalk_tuc_lecture_number: } { 3 }
  { \TYPE { lecture-number:passed } }
  { \TYPE { lecture-number:FAILED=\__ltxtalk_tuc_lecture_number: } }
\clist_if_in:NnTF \g__osglecture_continuation_counters_clist { chapter }
  { \TYPE { continuation-default:passed } }
  { \TYPE { continuation-default:FAILED } }
% auto-section-title defaults to true for the teaching header instance
% (re-enabled 2026-09-26 after the \osglecture_modes_keep_mode: argument-
% corruption bug -- likely the real cause of the earlier crash blamed on
% this feature -- was fixed; see development-docs/ToDo.md, "ltthemer +
% Co").
\bool_if:NTF \g__ltxtalk_auto_section_title_bool
  { \TYPE { auto-section-title-default:passed } }
  { \TYPE { auto-section-title-default:FAILED } }
% \__ltxtalk_tuc_if_section_active:TF and \__ltxtalk_tuc_teaching_middle:
% are \cs_new_protected:Npn (matching \__ltxtalk_tuc_if_lecture_number:TF's
% style), so they cannot be e-expanded for \str_if_eq:ee -- call the
% conditional directly instead (protection only matters for \edef-like
% contexts, not normal execution).
\__ltxtalk_tuc_if_section_active:TF
  { \TYPE { header-active-before-section:FAILED-unexpectedly-active } }
  { \TYPE { header-active-before-section:passed } }
\ExplSyntaxOff

% Rendered output verified once with pdftotext:
%   maketitle[osg] title line: "3. Kapitel: Falten und Schneiden"
%   frame header line 1 (2-row): "Kurz -- 3. Falten und Schneiden"
%   frame footer: "3 -- 1" (lecture number -- frame number)
\begin{frame}
  \maketitle[osg]
\end{frame}

\begin{frame}
  \frametitle{Testfolie}
\end{frame}

\section{Fourier-Transformation}

\ExplSyntaxOn
\__ltxtalk_tuc_if_section_active:TF
  { \TYPE { header-active-after-section:passed } }
  { \TYPE { header-active-after-section:FAILED-still-inactive } }
\str_if_eq:eeTF { \thesection } { 1 }
  { \TYPE { header-section-number:passed } }
  { \TYPE { header-section-number:FAILED=\thesection } }
\str_if_eq:eeTF { \tl_to_str:c { l__talk_section_tl } } { Fourier-Transformation }
  { \TYPE { header-section-title:passed } }
  { \TYPE { header-section-title:FAILED=\tl_to_str:c{l__talk_section_tl} } }
\ExplSyntaxOff

% Rendered output verified once with pdftotext:
%   frame header line 1 (2-row, after \section): "Kurz -- 1 Fourier-Transformation"
\begin{frame}
  \frametitle{Nach~der~Section}
\end{frame}

\END
\end{document}