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Correct handling of lost chars in boxes with LuaTeX #1691

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merged 4 commits into from
Mar 6, 2025
Merged

Correct handling of lost chars in boxes with LuaTeX #1691

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f4efc41
Update \tracinglostchars for LuaTeX in TL'25+
josephwright Mar 5, 2025
61f3920
Apply suggestions from code review
josephwright Mar 6, 2025
f71e0b4
Adjust the News entry
josephwright Mar 6, 2025
b274ad6
Further text refinement
josephwright Mar 6, 2025
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9 changes: 9 additions & 0 deletions base/changes.txt
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Expand Up @@ -6,6 +6,15 @@ to completeness or accuracy and it contains some references to files that are
not part of the distribution.
================================================================================

2025-03-05 Joseph Wright <[email protected]>
* ltplain.dtx
Set \tracinglostchars to 4 for recent LuaTeX releases (gh/1687)
Remove \tracinglostchars setting from \tracingall/\loggingall (gh/1687)

* ltfssbas.dtx
Set \tracinglostchars to 0 for all engines in \showhyphens


2025-03-01 Frank Mittelbach <[email protected]>

* ltexpl.dtx (section{Document-level command names for \pkg{expl3} functions}):
Expand Down
15 changes: 13 additions & 2 deletions base/doc/ltnews41.tex
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Expand Up @@ -390,8 +390,6 @@ \subsection{Fixing the spacing after display math}
%
\taggingissue{762}



\section{New or improved commands}

\subsection{Socket and plug conditionals}
Expand Down Expand Up @@ -578,8 +576,21 @@ \subsection{Improving the handling of \cs{label}, \cs{index}, and \cs{glossary}}
and then do nothing. We have now changed that behavior so that the
redefinitions in these places accept an extended syntax.
%

\githubissue{311}

\subsection{Tracing lost characters}

In LaTeX News 33~\cite{41:ltnews33} we announced that \cs{tracingall} changes
\cs{tracinglostchars} to an error condition. This change has been reverted and
\cs{tracingall} and \cs{tracingnone} no longer alter \cs{tracinglostchars} but
retain its current setting.

The default value used in \LaTeX{} is set so that lost character information is
written to the log and terminal. Users may wish to make this into an error, in
which case they should set the value to~5 (not~3); this works in all engines.

\githubissue{1687}

\section{Bug fixes}

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5 changes: 4 additions & 1 deletion base/ltfssbas.dtx
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Expand Up @@ -35,7 +35,7 @@
%
%
\ProvidesFile{ltfssbas.dtx}
[2025/02/20 v3.2p LaTeX Kernel (NFSS Basic Macros)]
[2025/03/05 v3.2q LaTeX Kernel (NFSS Basic Macros)]
% \iffalse
\documentclass{ltxdoc}
\begin{document}
Expand Down Expand Up @@ -2333,6 +2333,8 @@
% {Add version of \cs{showhyphens} that works with Xe\TeX.}
% \changes{v3.2m}{2024/06/17}
% {set \cs{tracinglostchars} to 0 in \cs{showhyphens}}
% \changes{v3.2q}{2025/03/05}
% {set \cs{tracinglostchars} to 0 in \cs{showhyphens} for all engines}
% The |\showhyphens| command must be redefined since the version in
% \texttt{plain.tex} uses |\tenrm|. We have also made some further
% adjustments for its use in \LaTeX.
Expand All @@ -2348,6 +2350,7 @@
\DeclareRobustCommand\showhyphens[1]{%
\setbox0\vbox{%
\color@begingroup
\tracinglostchars\z@
\everypar{}%
\parfillskip\z@skip\hsize\maxdimen
\normalfont
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25 changes: 16 additions & 9 deletions base/ltplain.dtx
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Expand Up @@ -32,7 +32,7 @@
%<*driver>
% \fi
\ProvidesFile{ltplain.dtx}
[2024/11/02 v2.3k LaTeX Kernel (Plain TeX)]
[2025/03/05 v2.3l LaTeX Kernel (Plain TeX)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltplain.dtx}
Expand Down Expand Up @@ -941,9 +941,20 @@
% (error on the terminal). This made us realize that we should
% change the default. Using \texttt{3} would really be the
% best, but for compatibility reasons we only use \texttt{2}.
% For recent Lua\TeX{} releases, we set \texttt{4}: this is offset by~2
% from the e-\TeX{} value as otherwise Lua\TeX{} only issues a warning
% for text in a box when the box is used, not saved. (Accepting values of
% 4 and 5 was updated in the \TeX{}~Live 2025 release.)
% \changes{v2.3g}{2021/07/16}{Use 2 as default value for \cs{tracinglostchars}}
% \changes{v2.3l}{2025/03/05}{Use 4 as default value for \cs{tracinglostchars}
% in Lua\TeX{} (gh/1687)}
% \begin{macrocode}
\tracinglostchars=2
\ifdefined\luatexversion
\ifnum\luatexversion>120
\tracinglostchars=4
\fi
\fi
% \end{macrocode}
% \begin{macrocode}
% \tracingcommands=0
Expand Down Expand Up @@ -1718,14 +1729,14 @@
% \changes{v2.3f}{2021/04/18}{Drop pre-$\varepsilon$-\TeX{} support}
% \changes{v2.3f}{2021/04/18}
% {Add \cs{tracingstacklevels} and \cs{tracinglostchars}=3}
% \changes{v2.3l}{2025/03/05}{Remove \cs{tracinglostchars} setting (gh/1691)}
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{2021/06/01}{\loggingall}
%<latexrelease> {\tracingstacklevels and \tracinglostchars=3}%
%<*2ekernel|latexrelease>
\edef\loggingall{%
\tracingstats\tw@
\tracingpages\@ne
\tracinglostchars\thr@@
\tracingparagraphs\@ne
\tracinggroups\@ne
\tracingifs\@ne
Expand Down Expand Up @@ -1794,6 +1805,9 @@
% \changes{v2.3f}{2021/04/18}{Drop pre-$\varepsilon$-\TeX{} support}
% \changes{v2.3f}{2021/04/18}
% {Add \cs{tracingstacklevels} and \cs{tracinglostchars}=3}
% \changes{v2.3j}{2023/11/07}{Set \cs{tracinglostchars} to 2 in
% \cs{tracingnone} (gh/549)}
% \changes{v2.3l}{2025/03/05}{Remove \cs{tracinglostchars} setting (gh/1691)}
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{2015/01/01}{\tracingnone}%
%<latexrelease> {turn off etex tracing}%
Expand All @@ -1814,13 +1828,6 @@
\tracinggroups\z@
\tracingparagraphs\z@
\tracingmacros\z@
% \end{macrocode}
% None really means go back to the \LaTeX{} ``default'' and for
% \cs{tracinglostchars} this should therefore be 2 these days.
% \changes{v2.3j}{2023/11/07}{Set \cs{tracinglostchars} to 2 in
% \cs{tracingnone} (gh/549)}
% \begin{macrocode}
\tracinglostchars\tw@
\tracingpages\z@
\tracingstats\z@
}%
Expand Down
4 changes: 2 additions & 2 deletions base/testfiles/github-0524.luatex.tlg
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Expand Up @@ -9,7 +9,7 @@ Don't change this file in any respect.
~..\b ->\c \relax
~...\c ->\d \relax
~....\d ->\tracingnone \leavevmode \tracingall hi
~.....\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
~.....\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{into \tracingassigns=0}
Expand All @@ -23,7 +23,7 @@ Don't change this file in any respect.
{\relax}
{\relax}
{\relax}
~.\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
~.\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{into \tracingassigns=0}
Expand Down
25 changes: 4 additions & 21 deletions base/testfiles/github-0524.tlg
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Expand Up @@ -10,7 +10,7 @@ Don't change this file in any respect.
~..\b ->\c \relax
~...\c ->\d \relax
~....\d ->\tracingnone \leavevmode \tracingall hi
~.....\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
~.....\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{\tracingrestores}
Expand All @@ -20,30 +20,13 @@ Don't change this file in any respect.
{\tracingassigns}
{into \tracingassigns=1}
{the letter h}
! Missing character: There is no h ("68) in font nullfont.
\d ->\tracingnone \leavevmode \tracingall h
i
\c ->\d
\relax
\b ->\c
\relax
\a ->\b
\relax
l. ...\nullfont \a
Missing character: There is no h in font nullfont!
{the letter i}
! Missing character: There is no i ("69) in font nullfont.
\d ->\tracingnone \leavevmode \tracingall hi
\c ->\d
\relax
\b ->\c
\relax
\a ->\b
\relax
l. ...\nullfont \a
Missing character: There is no i in font nullfont!
{\relax}
{\relax}
{\relax}
~.\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
~.\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{\tracingrestores}
Expand Down
34 changes: 34 additions & 0 deletions base/testfiles/github-0524.xetex.tlg
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@@ -0,0 +1,34 @@
This is a generated file for the LaTeX2e validation system.
Don't change this file in any respect.
{vertical mode: \tracingrestores}
{\tracingassigns}
{into \tracingassigns=1}
{select font nullfont}
{changing current font=\OT1/cmr/m/n/10}
{into current font=\nullfont}
~.\a ->\b \relax
~..\b ->\c \relax
~...\c ->\d \relax
~....\d ->\tracingnone \leavevmode \tracingall hi
~.....\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{\tracingrestores}
{\tracingonline}
{\tracingcommands}
{horizontal mode: \tracingrestores}
{\tracingassigns}
{into \tracingassigns=1}
{the letter h}
Missing character: There is no h ("68) in font nullfont!
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Interesting XeTeX behaves differently than pdfTeX when \tracinglostchars=2, but the same with pdfTeX when \tracinglostchars=3.

% \tracinglostchars=2
% pdftex
Missing character: There is no h in font nullfont!
% xetex
Missing character: There is no h ("68) in font nullfont!

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Yeah, doubt it's deliberate - but I'm not sure there is much to be done

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it isn't perfect but it isn't that much of a problem either (for us 1-2 extra tlg files due to the differences)

{the letter i}
Missing character: There is no i ("69) in font nullfont!
{\relax}
{\relax}
{\relax}
~.\tracingnone ->\tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
{\tracingassigns}
{changing \tracingassigns=1}
{\tracingrestores}
{\tracingonline}
{\tracingcommands}
6 changes: 3 additions & 3 deletions base/testfiles/github-robust-0123.luatex.tlg
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Expand Up @@ -186,7 +186,7 @@ l. ...\mruntest{ccc}
---------------------------------------
\listfiles -> \GenericError { }{LaTeX Error: Can be used only in preamble}{See the LaTeX manual or LaTeX Companion for explanation.}{Your command was ignored.\MessageBreak Type I <command> <return> to replace it with another command,\MessageBreak or <return> to continue without it.}
---------------------------------------
\loggingall -> \tracingstats \tw@ \tracingpages \@ne \tracinglostchars \thr@@ \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
\loggingall -> \tracingstats \tw@ \tracingpages \@ne \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
---------------------------------------
\loggingoutput -> \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen
---------------------------------------
Expand Down Expand Up @@ -238,11 +238,11 @@ l. ...\mruntest{ccc}
---------------------------------------
\sqsupset -> \GenericError { }{LaTeX Error: Command \sqsupset not provided in base LaTeX2e}{See the LaTeX manual or LaTeX Companion for explanation.}{Load the latexsym or the amsfonts package to define this symbol}
---------------------------------------
\tracingall -> \tracingonline \@ne \tracingstats \tw@ \tracingpages \@ne \tracinglostchars \thr@@ \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
\tracingall -> \tracingonline \@ne \tracingstats \tw@ \tracingpages \@ne \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
---------------------------------------
\tracingfonts -> \GenericWarning {(Font) }{LaTeX Font Warning: Command \tracingfonts not provided.\MessageBreak Use the `tracefnt' package.\MessageBreak Command found:}\count@
---------------------------------------
\tracingnone -> \tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
\tracingnone -> \tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
---------------------------------------
\unlhd -> \GenericError { }{LaTeX Error: Command \unlhd not provided in base LaTeX2e}{See the LaTeX manual or LaTeX Companion for explanation.}{Load the latexsym or the amsfonts package to define this symbol}
---------------------------------------
Expand Down
6 changes: 3 additions & 3 deletions base/testfiles/github-robust-0123.tlg
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Expand Up @@ -186,7 +186,7 @@ l. ...\mruntest{ccc}
---------------------------------------
\listfiles -> \GenericError { }{LaTeX Error: Can be used only in preamble}{See the LaTeX manual or LaTeX Companion for explanation.}{Your command was ignored.\MessageBreak Type I <command> <return> to replace it with another command,\MessageBreak or <return> to continue without it.}
---------------------------------------
\loggingall -> \tracingstats \tw@ \tracingpages \@ne \tracinglostchars \thr@@ \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
\loggingall -> \tracingstats \tw@ \tracingpages \@ne \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
---------------------------------------
\loggingoutput -> \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen
---------------------------------------
Expand Down Expand Up @@ -238,11 +238,11 @@ l. ...\mruntest{ccc}
---------------------------------------
\sqsupset -> \GenericError { }{LaTeX Error: Command \sqsupset not provided in base LaTeX2e}{See the LaTeX manual or LaTeX Companion for explanation.}{Load the latexsym or the amsfonts package to define this symbol}
---------------------------------------
\tracingall -> \tracingonline \@ne \tracingstats \tw@ \tracingpages \@ne \tracinglostchars \thr@@ \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
\tracingall -> \tracingonline \@ne \tracingstats \tw@ \tracingpages \@ne \tracingparagraphs \@ne \tracinggroups \@ne \tracingifs \@ne \tracingscantokens \@ne \tracingnesting \@ne \errorcontextlines \maxdimen \tracingstacklevels \maxdimen \tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxdimen \tracingmacros \tw@ \tracingcommands \thr@@ \tracingrestores \@ne \tracingassigns \@ne
---------------------------------------
\tracingfonts -> \GenericWarning {(Font) }{LaTeX Font Warning: Command \tracingfonts not provided.\MessageBreak Use the `tracefnt' package.\MessageBreak Command found:}\count@
---------------------------------------
\tracingnone -> \tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracinglostchars \tw@ \tracingpages \z@ \tracingstats \z@
\tracingnone -> \tracingassigns \z@ \tracingrestores \z@ \tracingonline \z@ \tracingcommands \z@ \showboxdepth \m@ne \showboxbreadth \m@ne \tracingoutput \z@ \errorcontextlines \m@ne \tracingstacklevels \z@ \tracingnesting \z@ \tracingscantokens \z@ \tracingifs \z@ \tracinggroups \z@ \tracingparagraphs \z@ \tracingmacros \z@ \tracingpages \z@ \tracingstats \z@
---------------------------------------
\unlhd -> \GenericError { }{LaTeX Error: Command \unlhd not provided in base LaTeX2e}{See the LaTeX manual or LaTeX Companion for explanation.}{Load the latexsym or the amsfonts package to define this symbol}
---------------------------------------
Expand Down
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