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+% \iffalse meta-comment
+%
+%% File: latex-lab-mathpkg.dtx
+%
+% Copyright (C) 2022,2023 The LaTeX Project
+%
+% It may be distributed and/or modified under the conditions of the
+% LaTeX Project Public License (LPPL), either version 1.3c of this
+% license or (at your option) any later version. The latest version
+% of this license is in the file
+%
+% https://www.latex-project.org/lppl.txt
+%
+%
+% The development version of the bundle can be found below
+%
+% https://github.com/latex3/latex2e/required/latex-lab
+%
+% for those people who are interested or want to report an issue.
+%
+%<*driver>
+\documentclass{l3doc}
+\EnableCrossrefs
+\CodelineIndex
+\begin{document}
+ \DocInput{latex-lab-mathpkg.dtx}
+\end{document}
+%</driver>
+%
+% \fi
+%
+%
+% \title{The \texttt{latex-lab-mathpkg} code\thanks{}}
+% \author{\LaTeX{} Project}
+%
+% \maketitle
+%
+% \newcommand\fmi[1]{\begin{quote} TODO: \itshape #1\end{quote}}
+% \newcommand\NEW[1]{\marginpar{\mbox{}\hfill\fbox{New: #1}}}
+% \providecommand\class[1]{\texttt{#1.cls}}
+% \providecommand\pkg[1]{\texttt{#1}}
+% \providecommand\hook[1]{\texttt{#1}}
+%
+% \begin{abstract}
+% \end{abstract}
+%
+% \tableofcontents
+%
+% \section{Introduction}
+%
+% This file implements adaptions to various math packages needed for
+% the tagging project.
+%
+% \MaybeStop{\setlength\IndexMin{200pt} \PrintIndex }
+%
+% \section{The Implementation}
+%
+% \begin{macrocode}
+%<@@=math>
+% \end{macrocode}
+%
+% \begin{macrocode}
+%<*kernel>
+% \end{macrocode}
+%
+% \subsection{File declaration}
+% \begin{macrocode}
+\ProvidesFile{latex-lab-mathpkg.ltx}
+ [2023-01-05 v0.1a mathpkg adaptions]
+% \end{macrocode}
+% \subsection{Tagpdf support}
+% To make the code independent from tagging being loaded and active
+% we load the \pkg{tagpdf-base} package:
+%
+% \begin{macrocode}
+\RequirePackage{tagpdf-base}
+% \end{macrocode}
+%
+%
+% \begin{macrocode}
+\AddToHook{package/breqn/after}{
+ \RegisterMathEnvironment{dmath}
+ \RegisterMathEnvironment{dgroup*}
+ \AddToHook{env/dmath/begin}{\tagpdfparaOff}
+ \AddToHook{env/dgroup*/begin}{\tagpdfparaOff}
+}
+% \end{macrocode}
+%
+% Force loading of \pkg{amsmath} before \pkg{cases}.
+% \begin{macrocode}
+\AddToHook {package/cases/before}{\RequirePackage{amsmath}}
+\AddToHook{package/cases/after}{
+ \RegisterMathEnvironment{subnumcases}
+}
+% \end{macrocode}
+%
+% \begin{macrocode}
+%</kernel>
+% \end{macrocode}
+% \subsection{Wrapper files for testphase key}
+% \Finale
+%