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-rw-r--r--macros/latex-dev/base/ltexpl.dtx37
1 files changed, 31 insertions, 6 deletions
diff --git a/macros/latex-dev/base/ltexpl.dtx b/macros/latex-dev/base/ltexpl.dtx
index a9be1b0521..6d7ec3ff60 100644
--- a/macros/latex-dev/base/ltexpl.dtx
+++ b/macros/latex-dev/base/ltexpl.dtx
@@ -33,7 +33,7 @@
%<*driver>
% \fi
\ProvidesFile{ltexpl.dtx}
- [2021/01/24 v1.3a LaTeX Kernel (expl3-dependent code)]
+ [2021/04/20 v1.3c LaTeX Kernel (expl3-dependent code)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltexpl.dtx}
@@ -82,21 +82,46 @@
% \begin{macrocode}
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2020/10/01}%
-%<latexrelease> {kernel@enddocument hooks}{Define kernel enddocument Hooks}%
-\let\@kernel@after@enddocument\@empty
-\let\@kernel@after@enddocument@afterlastpage\@empty
+%<latexrelease> {kernel@enddocument hooks}{Define several kernel hooks}
+% \end{macrocode}
+% We only initialize these kernel hooks if they are not already
+% existing. Otherwise they would be set to \cs{@empty} on rollback
+% which would be wrong because code that has been added to to them
+% may still have to be executed in the rollback situation . Instead
+% code that writes to them needs to handle the rollback as needed.
+% It is likely that we have to change that approach in the future,
+% but for now it should do.
+% (It is enough to test only for the existence of one hook, as all
+% got added at the same time.)
+% \changes{v1.3c}{2021/04/20}{Don't empty kernel hooks on rollback}
+% \begin{macrocode}
+\ifx\@kernel@after@enddocument\@undefined
+ \let \@kernel@after@enddocument \@empty
+ \let \@kernel@after@enddocument@afterlastpage \@empty
+% \end{macrocode}
+%
+% \begin{macro}{\@kernel@before@begindocument,\@kernel@after@begindocument}
+% For the similar reasons we also define those that are used in
+% \cs{document} because they too get material added to in early modules.
+% \begin{macrocode}
+ \let \@kernel@before@begindocument \@empty
+ \let \@kernel@after@begindocument \@empty
+\fi
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{0000/00/00}%
-%<latexrelease> {kernel@enddocument hooks}{Define kernel enddocument Hooks}%
+%<latexrelease> {kernel@enddocument hooks}{Define several kernel hooks}
%<latexrelease>\let\@kernel@after@enddocument\@undefined
%<latexrelease>\let\@kernel@after@enddocument@afterlastpage\@undefined
-%<latexrelease>\EndIncludeInRelease
+%<latexrelease>\let\@kernel@before@begindocument\@undefined
+%<latexrelease>\let\@kernel@after@begindocument\@undefined
%</2ekernel|latexrelease>
+%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
% \end{macro}
+% \end{macro}
%
% First define some blank commands, so that in case something goes wrong while
% loading \textsf{expl3}, we won't get strange \texttt{Undefined control