% \iffalse meta-comment
%
%% File: latex-lab-new-or-2.dtx
% Copyright (C) 2022-2026 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 latex-lab bundle is developed in the LaTeX2e GitHub.
% Issues may be reported at
%
%    https://github.com/latex3/latex2e/issues
%
\def\ltlabneworIIdate{2026-01-16}
\def\ltlabneworIIversion{0.86d}

%<*driver>
\DocumentMetadata{tagging=on,pdfstandard=ua-2}
\documentclass[kernel]{l3in2edoc}

\EnableCrossrefs
\CodelineIndex
\begin{document}
  \DocInput{latex-lab-new-or-2.dtx}
\end{document}
%</driver>
%
% \fi
%
%
% \title{The \texttt{latex-lab-testphase-new-or-2} code}
% \author{Frank Mittelbach, \LaTeX{} Project}
% % \date{v\ltlabneworIIversion\ \ltlabneworIIdate}
% \maketitle
%
% \newcommand\fmi[1]{\begin{quote} TODO: \itshape #1\end{quote}}
% \newcommand\NEW[1]{\marginpar{\mbox{}\hfill\fbox{New: #1}}}
% \providecommand\pkg[1]{\texttt{#1}}
%
%
% \begin{abstract}
%    This code implements changes to the output routine intended to be
%    moved in the \LaTeX{} kernel at some point in the future.
% \end{abstract}
%
%
%
%
% \section{Introduction}
%
%
%
%
% \StopEventually{\setlength\IndexMin{200pt}  \PrintIndex  }
%
%
% \section{The Implementation}
%
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
% \subsection{File declaration}
%    \begin{macrocode}
\ProvidesPackage{latex-lab-testphase-new-or-2}
        [\ltlabneworIIdate\space v\ltlabneworIIversion\space 
         Changes to the output routine]
%    \end{macrocode}
%        
% \subsection{\cs{@makecol} reimplementation}
%
%  \begin{plugdecl}{footnote-floats}
%    If \cs{DocumentMetadata} is used we use \plug{footnotes-floats}
%    as the default. In 2e compatibility mode this should be changed to
%    \plug{footnotes-floats-legacy}.
%    \begin{macrocode}
\AssignSocketPlug {build/column/outputbox}{footnotes-floats}
%    \end{macrocode}
% \end{plugdecl}
%
%
%
%  \begin{macro}[no-user-doc]{\@makecol@handlesplitfootnotes}
%  \begin{macro}[no-user-doc]{\@makecol@splitfootnotemessagehook}
%    This is only an early draft and doesn't do much.
%    Contains  incomplete preparation for tagging commented out.
% \fmi{Interfaces and code will change in the future}
%    \begin{macrocode}
\def\@makecol@handlesplitfootnotes {%
%  \ifx\splitfootnote@continuation\@empty \else
%    \setbox\footins\vbox{\splitfootnote@continuation\unvbox\footins}%
%    \global\let\splitfootnote@continuation\@empty
%  \fi
  \ifnum\insertpenalties>\z@
    \@makecol@splitfootnotemessagehook
%    \setbox\footins\vbox{\unvbox\footins --- END at split}%
%    \gdef\splitfootnote@continuation    {--- START after split}%
  \fi
}
%\def\splitfootnote@continuation{}
%    \end{macrocode}
%    This  could issue warning if split footnotes are encountered.
%    \begin{macrocode}
\let \@makecol@splitfootnotemessagehook \@empty
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%
%
%
%
%
% \subsection{\cs{@outputpage} reimplementation}
%
%   We still have to deal with various plug setting for tagging:
%    This needs documentation and moving.
%
%  \begin{plugdecl}{default}
%    \begin{macrocode}
\ExplSyntaxOn
%    \end{macrocode}
%    \fmi{where should these plug declarations go? tagpdf?}
%    \begin{macrocode}
\NewTaggingSocketPlug{build/page/header}{default}
   {
     \__tag_hook_kernel_before_head:
     #2
     \__tag_hook_kernel_after_head:
   }
%    \end{macrocode}
%    
%    \begin{macrocode}
\AssignTaggingSocketPlug{build/page/header}{default}
%    \end{macrocode}
%
%  \end{plugdecl}
%
%  \begin{plugdecl}{default}
%    \begin{macrocode}
\NewTaggingSocketPlug{build/page/footer}{default}
   {
     \__tag_hook_kernel_before_foot:
     #2
     \__tag_hook_kernel_after_foot:
   }
%    \end{macrocode}
%
%    \begin{macrocode}
\AssignTaggingSocketPlug{build/page/footer}{default}
%    \end{macrocode}
%
%  \end{plugdecl}
%
%  \begin{plugdecl}{default}
%    \begin{macrocode}
\NewTaggingSocketPlug{build/column/outputbox}{default}
  {
    \__tag_check_typeout_v:n { ====>~In~\token_to_str:N \@makecol
                               \c_space_tl\the\c@page }
    \tag_mc_add_missing_to_stream:Nn \@outputbox {main}
  }
%    \end{macrocode}
% %  \end{plugdecl}
%  \begin{plugdecl}{default}
%    \begin{macrocode}
\NewTaggingSocketPlug{build/column/footins}{default}
   { \tag_mc_add_missing_to_stream:Nn \footins {footnote} }
%    \end{macrocode}
%    The two sockets do nothing (default \plug{noop}) if we
%    are in lua mode. If not they get the \plug{default} assigned
%    \begin{macrocode}
\sys_if_engine_luatex:F   
   {         
     \AssignTaggingSocketPlug{build/column/outputbox}{default}
     \AssignTaggingSocketPlug{build/column/footins}{default}
   }
\ExplSyntaxOff 
%    \end{macrocode}
%  \end{plugdecl}
%
%
%
%
%
% \section  {Replacement for the \pkg{footmisc} package}
%
%    The replacement for \pkg{footmisc}. If the new code is used, we must replace
%    the package if it is loaded by the user:
%    \begin{macrocode}
\declare@file@substitution{footmisc.sty}{latex-lab-footmisc.ltx}
%    \end{macrocode}
%    This can be removed the moment the remaining hooks and sockets
%    have been integrated into footmisc, which will probably not
%    happen before the 2025/11 release.
%
%
%
% \section {Temp stuff that is related but should go to the kernel}
%
%    This is the code from \texttt{latex-lab-footnotes.dtx}.
%    \begin{macrocode}
\input{latex-lab-footnotes.ltx}
%    \end{macrocode}
%
%
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
% \Finale
%
