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-% \iffalse meta-comment
-%
-% Copyright (C) 2015-2021
-% The LaTeX Project and any individual authors listed elsewhere
-% in this file.
-%
-% This file is part of the LaTeX base system.
-% -------------------------------------------
-%
-% It may be distributed and/or modified under the
-% conditions of the LaTeX Project Public License, either version 1.3c
-% of this license or (at your option) any later version.
-% The latest version of this license is in
-% http://www.latex-project.org/lppl.txt
-% and version 1.3c or later is part of all distributions of LaTeX
-% version 2008 or later.
-%
-% This file has the LPPL maintenance status "maintained".
-%
-% The list of all files belonging to the LaTeX base distribution is
-% given in the file `manifest.txt'. See also `legal.txt' for additional
-% information.
-%
-% The list of derived (unpacked) files belonging to the distribution
-% and covered by LPPL is defined by the unpacking scripts (with
-% extension .ins) which are part of the distribution.
-%
-% \fi
-% Filename: latexchanges.tex
-
-\NeedsTeXFormat{LaTeX2e}
-
-\documentclass{ltxguide}
-
-\usepackage[T1]{fontenc}
-
-\usepackage{url}
-
-\title{Changes to the \LaTeXe{} format}
-
-\author{\copyright~Copyright 2015--2021, \LaTeX\ Project Team.\\
- All rights reserved.}
-
-\date{2021-06-08}
-
-% a few commands from doc
-\newcommand\Lpack[1]{\mbox{\textsf{#1}}}
-\newcommand\DescribeMacro[1]{\texttt{\string#1}}
-
-\newcommand\pkg[1]{\texttt{#1}}
-\newcommand\cs[1]{\texttt{\textbackslash #1}}
-
-\makeatletter % -- provide command introduced in new release
- % so this typesets with an old format
-
-\DeclareTextCommandDefault\textcommabelow[1]
- {\hmode@bgroup\ooalign{\null#1\crcr\hidewidth\raise-.31ex
- \hbox{\check@mathfonts\fontsize\ssf@size\z@
- \math@fontsfalse\selectfont,}\hidewidth}\egroup}
-
-\makeatother
-
-
-
-\ifx\href\undefined
- \newcommand\ghissue[1]{github #1}
- \newcommand\gnatsissue[1]{gnats #1}
- \newcommand\ltnewsissue[1]{\LaTeX\ News~#1}
- \newcommand\sxanswer[1]{\url{https://tex.stackexchange.com\slash a\slash #1}}
- \newcommand\sxquestion[1]{\url{https://tex.stackexchange.com\slash q\slash #1}}
-\else
- \newcommand\ghissue[1]{%
- \href{https://github.com/latex3/latex2e/issues/#1}{github #1}}
- \newcommand\gnatsissue[1]{%
- \href{https://www.latex-project.org/cgi-bin/ltxbugs2html?pr=latex/#1}{gnats #1}}
- \newcommand\ltnewsissue[1]{%
- \href{https://www.latex-project.org/news/latex2e-news/ltnews#1.pdf}{\LaTeX\ News~#1}}
- \newcommand\sxanswer[1]{%
- \url{https://tex.stackexchange.com/a/#1}}
- \newcommand\sxquestion[1]{%
- \url{https://tex.stackexchange.com/q/#1}}
-\fi
-
-
-\setcounter{tocdepth}{1} % don't show subsections
-
-
-\begin{document}
-
-\maketitle
-
-\begin{abstract}
-This document describes changes that were made to the
-\LaTeX\ format since the 2014-05-01 \LaTeX\ releases.
-
-
-As announced in \ltnewsissue{22}, the 2015 \LaTeX{} release adopts a new
-policy. Improvements and bug fixes will be made to the format sources,
-with the \Lpack{latexrelease} package being available to revert
-changes to use definitions from an earlier format.
-
-As a summary of changes for a main release will always be available in
-\LaTeX\ News, detailed changes are not repeated in this document,
-but changes in any patch releases will be listed in more
-detail here.
-
-More detailed change logs are available as
-\texttt{changes.txt} in the base distribution, and full code
- differences may be browsed via the code repository on GitHub
-see for example
-\url{https://github.com/latex3/latex2e/commits/master}.
-\end{abstract}
-
-\tableofcontents
-
-\newpage
-
-%\section{Introduction}
-
-\section{Changes introduced in 2021-06-01 patch~1}
-
-A further refinement to the handling of ``raw'' option lists added
-in the last release, see \ghissue{508}.
-
-Fixes an issue with rollback when \pkg{latexrelease} is loaded by some
-other package (as done for \texttt{platex} (\ghissue{577}).
-
-First aid for \pkg{ulem} and \pkg{varwidth} got added to help them
-along until they get corrected. \pkg{ulem} has a problem with the
-improved definition of \cs{hspace} and \pkg{varwidth} chokes on a
-newly introduced glue item in vertical lists, which is needed for
-paragraph hook handling (\ghissue{583}).
-
-
-\section{Changes introduced in 2021-06-01}
-
-The focus of this release is to provide further important building
-blocks for the future production of reliable tagged PDF output. Many
-other improvements have been made. Please see \ltnewsissue{33} for an
-overview of the new features and the change log in
-\texttt{changes.txt} for a more detailed list of individual changes.
-
-\section{Changes introduced in 2020-10-01 patch~4}
-
-This patch fixed two bugs in the hook management: if debugging for the
-L3 programming layer was turned on it reported inconsistent use of
-local/global variables. This was a spurious warning but nevertheless
-disconcerting (\ghissue{463}). The other bug was more serious, in some
-situations a wrong value of \verb=\CurrentFile= inside of file-related hooks
-could lead to errors (\ghissue{464}).
-
-We also added the documentation file \texttt{usrguide3.pdf} which
-will become the main home for documenting new features of \LaTeX. At
-this point in time it covers the \Lpack{xparse} functionality that has
-been added to the kernel.
-
-\section{Changes introduced in 2020-10-01 patch~3}
-
-This patch fixed some rollback issues that prevented successful
-rollback to other release levels in some cases. It also fixed an issue
-with file hooks involving files with explicit paths (\ghissue{422}).
-
-One important change was to handle hook declarations done in the
-document preamble in a special way, e.g., those done with
-\verb=\AtBeginDocument=. They are now always executed last and are not
-subject to the normal code sorting for hooks, because they are nearly always
-needed to overwrite earlier settings made in packages.
-
-Finally, the NFSS series handling was slightly changed to
-automatically drop surplus ``\texttt{m}''s from series specifications
-when needed (and warn about them when encountered), e.g.,
-``\texttt{mc}'' automatically becomes ``\texttt{c}'' which is the
-official NFSS name for a \emph{medium compact} series (\ghissue{453}).
-This was done to improve the fix in 2020-02-02 PL~5.
-
-\section{Changes introduced in 2020-10-01 patch~2}
-
-This patch fixed the passing of options to packages and classes when
-they are stored in a special place (denoted by \verb=\input@path=)
-instead of their normal location (\ghissue{414}). In that case the
-options got lost.
-
-\section{Changes introduced in 2020-10-01 patch~1}
-
-This patch fixed a file handling issue: to allow for spaces in file
-names quotes were used but this upsets Bib\TeX{} (\ghissue{400}). In
-addition, two rollback issues got corrected.
-
-\section{Changes introduced in 2020-10-01}
-
-Major enhancements in this release include pre-loading of the
-\Lpack{xparse} package for producing document-level commands with more
-complicated argument signatures and the new hook management system for
-\LaTeX{} documented in \texttt{lthooks-doc.pdf},
-\texttt{ltfilehook-doc.pdf} and \texttt{ltshipout-doc.pdf}.
-
-In addition there have been many smaller fixes and enhancements.
-Please see \ltnewsissue{32} for an overview of the new features and
-the change log in \texttt{changes.txt} for a more detailed list of
-individual changes.
-
-\section{Changes introduced in 2020-02-02 patch~5}
-
-The patch~4 dropped a bit too much in certain situations, e.g., it
-changed a series value of \texttt{semibold} (as used by
-\texttt{autoinst}) to \texttt{seibold}, rendering it useless. So we
-now only correct series values if they are a member of the
-following list: \texttt{ulm}, \texttt{elm}, \texttt{lm}, \texttt{slm},
-\texttt{mm}, \texttt{sbm}, \texttt{bm}, \texttt{ebm}, \texttt{ubm},
-\texttt{muc}, \texttt{mec}, \texttt{mc}, \texttt{msc}, \texttt{msx},
-\texttt{mx}, \texttt{mex} or \texttt{mux}. Here we assume that people
-intended to follow the NFSS convention but somehow got it wrong. So we
-drop one ``m'' and also add a warning that the
-\verb=\DeclareFontShape= declaration in question should be updated
-(\ghissue{293}).
-
-
-\section{Changes introduced in 2020-02-02 patch~4}
-
-In some cases the \texttt{filecontents} environment was opening the
-file for writing without quoting it, so that files with spaces failed
-(\ghissue{284}).
-
-Ensure that \verb=\DeclareFontShape= drops surplus ``m'' in situations
-where an \texttt{.fd} incorrectly specifies \texttt{mc} instead of
-\texttt{c}, etc.\ (\ghissue{289}).
-
-\section{Changes introduced in 2020-02-02 patch~3}
-
-Support the following scenario:
-\begin{verbatim}
-\fontfamily{ptm}\selectfont text \textbf{\sffamily bold sans text}
-\end{verbatim}
-The default bold series for \texttt{ptm} is \texttt{b} so
-\verb=\textbf= switches to that. The \verb=\sffamily= then tried to
-find \texttt{OT1/cmss/b/n} which doesn't exist instead of first
-altering the series default to use \texttt{bx} as needed for Computer
-Modern Sans Serif. This has now been corrected (\ghissue{277}).
-
-
-\section{Changes introduced in 2020-02-02 patch~2}
-
-Correct \verb=\capitalacute=, etc.\ so that they work in
-\texttt{tabbing} (\ghissue{271}). Provide \verb=\@defaultfamilyhook= to
-support CJK packages (\ghissue{269}). Provide a list of \texttt{fontenc}
-loads with their options in \verb=\@fontenc@load@list= so that Babel
-can determine the right \verb=\latinencoding= value (\ghissue{273}).
-
-
-\section{Changes introduced in 2020-02-02 patch~1}
-
-Fixed a misspelled command name that caused trouble (\ghissue{264}). Make
-\texttt{textcomp} package issue only info messages about glyph
-substitutions (\ghissue{262}) and warn if it attempts to run in an old format (\ghissue{260}).
-
-\section{Changes introduced in 2020-02-02}
-
-Major enhancements in this release include pre-loading \Lpack{expl3}
-to improve startup times, especially with Lua\TeX\ and Xe\TeX, and
-extra features in the font selection mechanism. Please see
-\ltnewsissue{31} for an overview of the new features and the change
-log in \texttt{changes.txt} for a more detailed list of individual
-changes.
-
-
-\section{Changes introduced in 2019-10-01 patch~3}
-
-Further fixes to the handling of filenames, expand macros (and
-\verb|\jobname| \emph{before} removing \verb|"|, not after.
-
-\section{Changes introduced in 2019-10-01 patch~2}
-
-Further fixes to the handling of filenames, \ghissue{204}: non-ascii
-filenames and filenames with spaces and multiple dots should now work
-in \verb|\includegraphics|.
-
-Reclassify some luatex callbacks. Other fixes for Issues raised:
-\ghissue{198}, \ghissue{201}, \ghissue{202}, \ghissue{205}.
-
-\section{Changes introduced in 2019-10-01 patch~1}
-
-Adjustments to \verb|\set@curr@file|, and \verb|\@extracolsep|.
-
-Added missing \verb=\else= branch in \texttt{nfssfont} so that
-\verb=\action= is executed if provided.
-
-\section{Changes introduced in 2019-10-01}
-
-Introduced \LaTeX\texttt{-dev} formats for pre testing future \LaTeX{}
-releases. Now there's a \texttt{latex-base-dev} package on CTAN which
-contains a pre-release of the \LaTeXe{} kernel and both \TeX Live and
-MiK\TeX{} include the standard \LaTeX{} executables (\texttt{pdflatex},
-\texttt{lualatex}, etc.) with \texttt{-dev} appended, which use the
-pre-release format.
-
-The handling of Unicode characters was improved by making them safe
-inside \verb|\ref|s and \verb|\label|s, by using \verb|\ifincsname|
-to make these characters safe in these contexts (\ghissue{95}).
-
-In line with the better handling of Unicode characters, file names
-can now contain any Unicode character plus spaces, as these cases
-are now correctly handled by the kernel.
-
-An optional argument was added to the \texttt{filecontents} environment,
-to which a comma-separated list of options can be given. The options
-include \texttt{overwrite} (or \texttt{force}), \texttt{nosearch}, and
-\texttt{noheader} (which has the same effect as the starred form of the
-environment). The environment is now allowed anywhere in the document.
-
-A plethora of \LaTeX{} commands was made robust so that fewer
-\verb|\protect| are needed when using some commands in moving arguments.
-There are a few border cases where it's tricker to make the command
-robust or where it's not worth it to do so, but most reasonable use
-cases are covered. The most notable change was \verb|\begin| and
-\verb|\end|, which are now robust and won't break when used in moving
-arguments.
-
-An extra \verb|\hskip 1sp| was added to \verb|c|-column table cells to
-protect against the presence of an \verb|\unskip| in the table cell
-(\ghissue{102}).
-
-\texttt{U+012F} which is ``i with ogonek'' should produce an
-``i'' and not a ``dotless i''. This has been corrected
-(\ghissue{122}).
-
-The Unicode slots \texttt{27E8} and \texttt{27E9} have been mapped to
-\verb|textlangle| and \verb|textrangle| which is the recommended mapping
-(\ghissue{110}).
-
-Basic ligatures (ff, fi, fl, ffi, ffl, ft, st) can now be input as a
-single unicode character in pdf\TeX, which is useful when copy-pasting
-(\ghissue{154}).
-
-\verb|\InputIfFileExists{foo}{\input{bar}}{}|
-did not load the files \texttt{foo.tex} and \texttt{bar.tex} but
-would load \texttt{bar.tex} twice. This has been corrected (\ghissue{109}).
-
-The \textsf{fncylab} and \textsf{varioref} packages changed \LaTeX's internal
-counter prefix commands \verb|p@...| so that they would take the counter
-value as an argument instead of just acting as a prefix to them. These
-packages also provided the \verb|\labelformat| macro to change the prefix
-macro and \verb|\Ref| so that using counters defined that way in the
-beginning of sentences would have the proper capitalization. These features
-were added to the \LaTeXe{} kernel.
-
-The kernel now says ``Trying to load\ldots''
-instead of ``Try loading \ldots'' in one of its informal
-messages to match style of similar messages (\ghissue{107}).
-
-\verb|\DeclareErrorFont| would change the font size to 10\,pt which, when
-used in the wrong place, would make incorrect font settings in the document.
-This has now been fixed (\gnatsissue{4399}).
-
-The default action of the file \texttt{nfssfont.tex} was set to produce a
-font table, so that one can simply hit enter instead of having to write
-\verb=\table\bye=.
-
-The \LaTeX{} kernel now provides dummy (empty) definitions for the two
-commands \verb|\conditionally@traceoff| and
-\verb|\conditionally@traceon| from the \texttt{trace} package so they
-can be used by package developers without worrying about them being
-defined or not (\ghissue{164}).
-
-
-
-
-
-\section{Changes introduced in 2018-12-01}
-
-Further additions to the characters supported by default in UTF-8.
-The commands \verb|\guillemetleft| and \verb|\guillemetright| are
-provided as alias for the names based on the Adobe font names
-(\ghissue{65}).
-
-The use of potrusion in tables of contents is suppressed by default,
-see \sxquestion{172785}.
-
-The handling of visible space in verbatim was adjusted for
-\ghissue{69} and \ghissue{70}.
-
-Spaces are removed from the argument passed to BiBTeX, \ghissue{88}.
-
-New commands \verb|\Hwithstroke| and \verb|\hwithstroke| added to T1 encoding support.
-
-The internal box structure for floats is adjusted to preserve box
-levels of split hyperlinks, avoiding a fatal pdftex error. \ghissue{94}.
-
-
-\section{Changes introduced in 2018-04-01 patch~5}
-Improved support for non ASCII filenames on the command line on
-filesystems using legacy encodings.
-
-Adjusted the new package rollback code so that some edge cases where rollback
-can not be guaranteed become a warning not an error.
-
-\section{Changes introduced in 2018-04-01 patch~4}
-No changes to the format, but \texttt{docstrip} adjusted so that non-ASCII
-\texttt{.ins} files work with the new UTF-8 defaults.
-
-\section{Changes introduced in 2018-04-01 patch~3}
-Additional adjustments for GitHub issues \ghissue{34} and \ghissue{38}, adjustment to the
-location of some documentation files, such as \texttt{source2e.tex} to
-be installed in the documentation sources not the default \TeX\ input
-tree.
-
-
-\section{Changes introduced in 2018-04-01 patch~2}
-Additional adjustments for GitHub issues \ghissue{32} and \ghissue{33}.
-
-\section{Changes introduced in 2018-04-01 patch~1}
-Make \verb|\UseRawInputEncoding| and \Lpack{latexrelease} reset \verb|\inputencodingname|
-when disabling the UTF-8 input handling.
-
-\section{Changes introduced in 2018-04-01}
-Further details of changes at this release are given in \ltnewsissue{28}, but in brief
-the main changes are as listed below.
-
-The default encoding for files has been changed to UTF-8.
-
-A new possibility to refer to older versions of packages has been added.
-
-New commands previously available in \Lpack{remreset} and
-\Lpack{chngcntr} packages for controlling counters have been added.
-
-The definition of \verb|\@ifundefined| has been refined to use the e-\TeX \verb|\ifcsname|
-primitive when available, and to avoid defining the command being tested to be \verb|\relax|
-in the case that it was previously undefined.
-
-\section{Changes introduced in 2017-04-15}
-Optionally, \LaTeX{} format and package dates may use ISO style dates with
-\texttt{-} rather than \texttt{/}.
-
-For Unicode \TeX{}s, made further adjustments to the composite accent
-code in \texttt{tuenc.def}, and further updates tracking changes in
-Lua\TeX, now at 1.04.
-
-Previously defining an encoding-specific composite with an undeclared
-accent (or an accent declared later) gave no error, but did nothing useful.
-\LaTeX\ will now detect this and give the accent command a default definition
-as an error, allowing the declared composite to work as intended.
-
-The definition of \verb|\-| is adjusted to match the comments in
-\gnatsissue{3855} to accommodate non standard settings of \verb|\hyphenchar|.
-
-In parboxes and similar settings, \verb|\lineskiplimit| is now
-reset (to the existing default value, \verb|\normallineskiplimit|).
-See \sxanswer{359934}.
-
- The code for \verb|\newpage| has been adjusted to add a test on the value of
-\verb|\prevdepth| so that the depth of the last line is preserved in
-forced page breaks.
-
-\section{Changes introduced in 2017/01/01 patch~3}
-Emergency patch to correct a typo in a change introduced in patch~2.
-
-\section{Changes introduced in 2017/01/01 patch~2}
-More adjustments for TU encoding, allowing for characters missing in
-common system fonts. Additional \texttt{fd} files
-for Latin Modern variants are included in the documented sources.
-
-\section{Changes introduced in 2017/01/01 patch~1}
-Fixes to TU encoding definitions for Lua\TeX\ and Xe\TeX.
-
-\section{Changes introduced in 2017/01/01}
-
-A new test is added during format making that e\TeX\ extensions are
-available. As noted in \LaTeX\ news, e\TeX\ will now be required to
-build \LaTeX.
-
-Further updates tracking changes for Lua\TeX~1.0.
-
-The definition of \verb|\showhyphens| is changed in formats built
-with Xe\TeX, as the original version, inherited from plain \TeX\ does
-not work with Xe-\TeX.
-
-Changes to the default encoding used by Lua\TeX\ and Xe\TeX\ formats to
-be TU (Unicode) rather than OT1 (7 bit legacy \TeX\ encoding).
-
-\section{Changes introduced in 2016/03/31 patch~3}
-Fixes to \verb|\newinsert| and \verb|\extrafloats|.
-
-\section{Changes introduced in 2016/03/31 patch~2}
-Adjustments to \verb|\c{g}| in OT1 encoding.
-
-\section{Changes introduced in 2016/03/31 patch~1}
-Adjust the upper limit for Character Class allocation in Xe-\TeX\ to
-4096 to match a change in Xe-\TeX.
-
-\section{Changes introduced in 2016/03/31}
-Modify picture mode as suggested in latex/4452 to avoid leaders of
-almost zero length.
-
-Modify the checks in \verb|\DeclareMathSymbol| and related commands
-so that they do not give errors with new Lua\TeX\ releases.
-
-\section{Changes introduced in 2016/02/01}
-Adjustments to Lua\TeX\ support to match changes to the Lua\TeX\ engine,
-and to the character class allocation in Xe\TeX.
-
-Load Unicode data from new generic \texttt{unicode-data} distribution.
-
-\section{Changes introduced in 2015/10/01 patch~2}
-
-This release fixes the behavior of the allocation mechanism if the switch
-from the standard to extended pool takes place within a group.
-
-\section{Changes introduced in 2015/10/01 patch~1}
-This release allows \Lpack{latexrelease} to revert the
-Lua\TeX{}-specific
-changes, in particular fixing an incorrect date in part of the mechanism and
-adding a method to disable callback management entirely.
-
-\section{Changes introduced in \LaTeX\ 2015/10/01}
-
-\subsection{LuaTeX allocation}
-Almost all changes at this release relate to incorporating allocation macros for luatex into the format
-as done for etex and xetex in 2015/01/01. For details see |ltluatex.dtx| or \ltnewsissue{22}.
-|ltluatex.dtx| now forms a new chapter (N) in the documented sources, |source2e.tex|.
-
-
-\subsection{Increased number of floats}
-The default float list has been increased from 18 to 52 registers if
-e\TeX\ is available.
-The list can be increased further using |\extrafloats| however this
-default allocation uses classic registers below 256 so the registers are
-also available for |\newinsert| as described below.
-
-\subsection{Improved \texttt{\textbackslash newinsert}}
-The command |\newinsert| has been extended to take registers from the lists of free float
-registers once the classic register allocation is used up. This should make it highly unlikely
-to get ``no room'' errors on register allocation assuming the format is used with
-an e-\TeX\ based \TeX\ engine.
-
-\subsection{New accent, \texttt{\textbackslash textcommabelow} (pr/4414)}
-The command |\textcommabelow| has been added. This is mainly intended for Romanian letters
-\textcommabelow{S}\,\textcommabelow{s}\,\textcommabelow{T}\,\textcommabelow{t}.
-
-\subsection{Unicode 8}
-The file |unicode-letters.def| used to initialize character data in
-Unicode \TeX\ variants has been regenerated from data files updated
-to Unicode~8.
-
-\section{Changes introduced in 2015/01/01 patch~2}
-There were no changes to the format at this release, but the sources were fixed to fix bug latex/4434
-affecting bottom float positioning if the \Lpack{latexrelease} package was used.
-
-\section{Changes introduced in 2015/01/01 patch~1}
-This release re-introduces the ``Patch Level'' scheme for identifying
-releases between main ``dated'' releases. Early \LaTeXe\ releases
-included a mechanism whereby updates could be provided by a
-\emph{patch
- file}. This was mainly intended to allow updates to be made without
-downloading the full sources again, which was an important
-consideration with download speeds and costs at the time.
-
-The new mechanism incorporates any changes directly into the sources,
-but having the patch level identified in the banner allows the
-\LaTeX\ release to be identified, even if (as in this case) most of the
-changes do not affect the format but affect other base packages such
-as \Lpack{latexrelease} and \Lpack{inputenc}. The patch level is shown
-in the banner at the start of the job, but does not affect the date
-handling of the |\IncludeInRelease| mechanism.
-
-Apart from re-arranging the version banner, the only change in the
-format is that |\newtoks| was accidentally defined twice, using the
-old and new allocation scheme described in Section \ref{e@alloc}.
-The old definition is now only in the \Lpack{latexrelease} package,
-for use when emulating old formats.
-
-
-
-
-\section
-[Changes between \LaTeX\ releases 2014/05/01 and 2015/01/01]
-{Changes between \LaTeX\ releases 2014/05/01 and 2015/01/01\footnote{Much of this text
-is taken from \Lpack{fixltx2e} package which was formerly used to make such changes available separately.}}
-
-\subsection{Support for \LaTeX\ version changes}
-\DescribeMacro{\includeInRelease}\arg{date}\oarg{date}\arg{label}\arg{message}\arg{code}
-
-\smallskip
-
-The |\includeInRelease| command has been added to support backward and
-forward compatibility for the \LaTeX\ format. It supports the
-declaration of conditional code that can be loaded based on options
-given to the \Lpack{latexrelease} package. Its use is described in
-detail in the \Lpack{latexrelease} package documentation.
-
-\subsection{New Allocation Code\label{e@alloc}}
-Previously |\newcount| and related commands were based on classic TeX
-and only allocated in the range 0--255. This was extended (in
-different ways) for e-\TeX\ in the |etex| package and in the
-|xelatex.ini| and |lualatex.ini| files used in those formats. Related
-to this the number of boxes allocated to store floats was
-limited. This was extended to a certain extent in the |morefloats|
-package (by Don Hosek and H.-Martin Muench) but the new allocation
-incorporates float allocation directly and supports much larger float
-lists using the extended registers.
-
-The new code allocates registers in the full extended range (
-$2^{15}-1$ for etex and xelatex, $2^{16}-1$ for lualatex.
-In addition a new command |\extrafloats| is provided.
-
-\DescribeMacro{\extrafloats}\arg{number}
-\smallskip
-
-This allocates additional registers for the \LaTeX\ float system to
-hold figures and tables etc. Similar functionality has been
-available via the \Lpack{morefloats} package but this is a different
-implementation using extended e-\TeX\ registers when available so
-allows many more registers to be reserved for floats as they are
-allocated from a pool of 32 or 64 thousand rather than 256 registers,
-depending on the engine in use.
-
-\DescribeMacro{\newmarks}\arg{command}
-\smallskip
-
-e-\TeX\ only, previously available via the \Lpack{etex} package.
-Allocates commands to use the extended e-\TeX\ mark mechanism.
-
-\DescribeMacro{\newXeTeXintercharclass}\arg{command}
-\smallskip
-
-Xe-\TeX\ only, previously in the Xe-\LaTeX\ format, but added via
-|xelatex.ini| not part of the core release.
-Allocates commands to use the Xe-\TeX\ character class mechanism.
-
-
-\subsection{e-\TeX\ tracing if available}
-|\loggingall| (Usually used via |\tracingall|) is extended to enable
-additional e-\TeX\ tracing if e-\TeX\ is available. (|\tracingall|
-extension has been available as part of the |etex| package previously).
-
-Also based on code from the |etex| package, a command |\tracingnone|
-is added to reverse the effects of |\tracingall| and turn off all primitive
-\TeX\ tracing. A new command |\hideoutput| has been added which resets the
-tracing parameters set by |\showoutput|.
-
-
-
-
-\subsection{\texttt{\textbackslash textsubscript} not defined in
- latex.ltx (pr/3492)}
-
-\begin{verbatim}
->>Number: 3492
->>Category: latex
->>Synopsis: \textsubscript not defined in latex.ltx
->>Arrival-Date: Tue Jan 14 23:01:00 CET 2003
->>Originator: Ionel Mugurel Ciobica
-
-I use \textsubscript much more often than \textsuperscript, and
-\textsubscript it is not defined in latex.ltx. Could you please
-consider including the definition of \textsubscript in the latex.ltx
-for the next versions of LaTeX. Thank you.
-\end{verbatim}
-
-\subsection{\texttt{\textbackslash @} discards spaces when moving
- (pr/3039)}
-
-\begin{verbatim}
->>Number: 3039
->>Category: latex
->>Synopsis: \@ discards spaces when moving
->>Arrival-Date: Sat May 22 09:01:06 1999
->>Originator: Donald Arseneau
->>Description:
-The \@ command expands to \spacefactor\@m in auxiliary files,
-which then ignores following spaces when it is reprocessed.
-\end{verbatim}
-
-\subsection{1-col fig can come before earlier 2-col fig
- (pr/2346)}
-
-\begin{verbatim}
->>Number: 2346
->>Category: latex
->>Synopsis: 2-col: 1-col fig can come before earlier 2-col fig
->>Arrival-Date: Wed Dec 18 15:41:07 1996
->>Originator: bil kleb
->>Description:
-as documented in Lamport's book, p. 198, concerning figure
-placement, "a figure will not be printed before an earlier
-figure, and a table will not be printed before an earlier
-table." however, there is a footnote stating, "However,
-in two-column page style, a single-column figure can come before
-an earlier double-column figure, and vice versa."
-
-This twocolumn behavior is undesirable---at least by me and
-most professional organizations i publish in. ed snyzter developed
-a hack fix for 2.09 several years ago which links the two
-counters, but i have not run across a similar "fix" for 2e...
-\end{verbatim}
-
-Originally fixed in package \Lpack{fix2col} which was merged into
-this package. Documentation and code from this package have been
-merged into this file.
-
-\subsubsection{Notes on the Implementation Strategy}
-
-The standard output routine maintains two lists of floats that have
-been `deferred' for later consideration. One list for single column
-floats, and one for double column floats (which are always
-immediately put onto their deferred list). This mechanism means
-that \LaTeX\ `knows' which type of float is contained in each box
-by the list that it is processing, but having two lists means
-that there is no mechanism for preserving the order between the
-floats in each list.
-
-The solution to this problem consists of two small changes to
-the output routine.
-
-Firstly, abandon the `double column float list' |\@dbldeferlist|
-and change every command where it is used so that instead the
-same |\@deferlist| is used as for single column floats.
-That one change ensures that double and single column floats
-stay in the same sequence, but as \LaTeX\ no longer `knows'
-whether a float is double or single column, it will happily
-insert a double float into a single column, overprinting the
-other column, or the margin.
-
-The second change is to provide an alternative mechanism for
-recording the two column floats. \LaTeX\ already has a compact
-mechanism for recording float information, an integer count register
-assigned to each float records information about the `type' of float
-`figure', `table' and the position information `htp' etc.
-
-The type information is stored in the `high' bits, one bit position
-(above `32') allocated to each float type. The `low' bits store
-information about the allowed positions, one bit each allocated for
-|h t b p|. In the \LaTeX2.09 system, the bit corresponding to `16'
-formed a `boundary' between these two sets of information, and it
-was never actually used by the system. Ed Sznyter's
-\Lpack{fixfloats} package not unreasonably used this position to
-store the double column information, setting the bit for double
-column floats. Then at each point in the output routine at which a
-float is committed to a certain region, an additional check must be
-made to check that the float is (or is not) double column. If it
-spans the wrong number of columns it is deferred rather than being
-added.
-
-Unfortunately the bit `16' is not available in \LaTeXe. It is used
-to encode the extra float position possibility `|!|' that was added
-in that system. It would be possible to use position `32' and to
-move the flags for `table', `figure',\ldots\ up one position, to
-start at 64, but this would mean that in principle one less float
-type would be supported, and more importantly is likely to break
-any other packages that assume anything about the output routine
-internals. So here I instead use another mechanism for flagging
-double column floats: By default all floats have depth 0pt.
-This package arranges that double column ones have depth 1sp.
-This information may then be used in the same manner as in
-the \Lpack{fixfloats} package, to defer any floats that are not of
-the correct column spanning type.
-
-
-
-\subsection{Infinite glue found (pr/4023 and pr/2346)}
-
-The fix for pr/2346 did not work as intended when used in conjunction
-with |\enlargethispage| as the latter introduced an infinite negative
-glue at the bottom of the page. That in turn make a |\vsplit|
-operation to get at the column marks invalid.
-
-\subsection{Wrong header for twocolumn (pr/2613)}
-
-\begin{verbatim}
->>Number: 2613
->>Category: latex
->>Synopsis: wrong headline for twocolumn
->>Arrival-Date: Mon Sep 22 16:41:09 1997
->>Originator: Daniel Reischert
->>Description:
-When setting the document in two columns
-the headline shows the top mark of the second column,
-but it should show the top mark of the first column.
-\end{verbatim}
-
-Originally fixed in package \Lpack{fix2col} which was merged into
-this package. Documentation and code from this package have been
-merged into this file.
-
-\subsubsection{Notes on the Implementation Strategy}
-
-The standard \LaTeX\ twocolumn system works internally by making
-each column a separate `page' that is passed independently to \TeX's
-page breaker. (Unlike say the \Lpack{multicol} package, where all
-columns are gathered together and then split into columns later,
-using |\vsplit|.) This means that the primitive \TeX\ marks that are
-normally used for header information, are globally reset after the
-first column. By default \LaTeX\ does nothing about this.
-A good solution is provided by Piet van Oostrum (building on earlier
-work of Joe Pallas) in his \Lpack{fixmarks} package.
-
-After the first column box has been collected the mark information
-for that box is saved, so that any |\firstmark| can be
-`artificially' used to set the page-level marks after the second
-column has been collected. (The second column |\firstmark| is not
-normally required.) Unfortunately \TeX\ does not provide a direct
-way of knowing if any marks are in the page, |\firstmark| always has a
-value from previous pages, even if there is no mark in this page.
-The solution is to make a copy of the box and then |\vsplit| it
-so that any marks show up as |\splitfirstmark|.
-
-The use of |\vsplit| does mean that the output routine will globally
-change the value of |\splitfirstmark| and
-|\splitbotmark|. The \Lpack{fixmarks} package goes to some trouble
-to save and restore these values so that the output routine does
-\emph{not} change the values. This part of \Lpack{fixmarks} is not
-copied here as it is quite costly (having to be run on every page) and
-there is no reason why anyone writing code using |\vsplit| should
-allow the output routine to be triggered before the split marks have
-been accessed.
-
-
-
-\subsection{\texttt{\textbackslash setlength} produces error if
- used with registers like \texttt{\textbackslash dimen0} (pr/3066)}
-
-\begin{verbatim}
->>Number: 3066
->>Category: latex
->>Synopsis: \setlength{\dimen0}{10pt}
->>Arrival-Date: Tue Jul 6 15:01:06 1999
->>Originator: Heiko Oberdiek
->>Description:
-The current implementation of \setlength causes an error,
-because the length specification isn't terminated properly.
-More safe:
-\def\setlength#1#2{#1=#2\relax}
-\end{verbatim}
-
-\subsection{Fewer fragile commands}
-
-\begin{verbatim}
->>Number: 3816
->>Category: latex
->>Synopsis: Argument of \@sect has an extra }.
->>Arrival-Date: Sat Oct 22 23:11:01 +0200 2005
->>Originator: Susanne Wunsch
-
-Use of a \raisebox in \section{} produces the error message
-mentioned in the subject.
-
-PR latex/1738 described a similar problem, which has been solved
-10 years ago. Protecting the \raisebox with \protect solved my
-problem as well, but wouldn't it make sense to have a similar fix
-as in the PR?
-
-It is particularly confusing, that an unprotected \raisebox in a
-\section*-environment works fine, while in a \section-environment
-produces error.
-\end{verbatim}
-
-While not technically a bug, in this day and age there are few
-reasons why commands taking optional arguments should not be robust.
-
-\subsubsection{Notes on the implementation strategy}
-
-Rather than changing the kernel macros to be robust, we have decided
-to add the macro \DescribeMacro{\MakeRobust}|\MakeRobust| in
-\Lpack{fixltx2e} so that users can easily turn fragile macros into
-robust ones. A macro |\foo| is made robust by doing the simple
-|\MakeRobust{\foo}|. \Lpack{fixltx2e} makes the following kernel
-macros robust: |\(|, |\)|, |\[|, |\]|,
- |\makebox|, |\savebox|,
-|\framebox|, |\parbox|, |\rule| and |\raisebox|.
-
-\ldots TODO \ldots fleqn vesion of |\[\]|
-
-\subsection{\texttt{\textbackslash addpenalty} ruins flush-bottom (pr/3073)}
-
-\begin{verbatim}
->>Number: 3073
->>Category: latex
->>Synopsis: \addpenalty ruins flush-bottom
->>Arrival-Date: Sat Jul 17 05:11:05 1999
->>Originator: Donald Arseneau
->>Description:
-Just to keep in mind for further development eh?
-A page break at an \addpenalty after \vspace does *not*
-give a flush-bottom page. (The intent of \addpenalty is
-apparently just to preserve the flush bottom by putting
-the breakpoint `above' the skip.)
-\end{verbatim}
-
-\subsection{Within counters only reset next level down (pr4393)}
-
-This is actually implicitly documented behavior in the \LaTeX{}
-Manual that states that |\stepcounter| resets all counters marked
-``within''. However it means that if, for example, theorems are
-numbered within sections and you start a new chapter in a book, the
-section counter is reset to zero but the theorem counter is not
-until the first section appears. Thus a theorem directly within the
-chapter body (without a new section) would show an incremented
-number relative to the last theorem of the previous chapter.
-
-
-For this reason we are now resetting all levels of within in one go
-even if that means that some of these resets may happen several times
-unnecessarily.
-
-
-\subsection{Check the optional arguments of floats}
-
-By default LaTeX silently ignores unknown letters in the optional
-arguments of floats. |\begin{figure}[tB]| the |B| is ignored so it
-acts like |\begin{figure}[t]| However |\begin{figure}[B]| does
-\emph{not} act like |\begin{figure}[]| as the check for an empty
-argument, or unsupplied argument, is earlier. |[]| causes the
-default float placement to be used, but |[B]| means that \emph{no}
-float area is allowed and so the float will not be placed until the
-next |\clearpage| or end of document, no warning is given.
-
-This package adds a check on each letter, and if it not one of
-|!tbhp| then an error is given and the code acts as if |p| had been
-used, so that the float may be placed somewhere.
-
-\subsection{\texttt{\textbackslash DeclareMathSizes} only take pts.
- (pr/3693)}
-
-\begin{verbatim}
->>Number: 3693
->>Category: latex
->>Synopsis: \DeclareMathSizes only take pts.
->>Arrival-Date: Fri Jun 11 16:21:00 CEST 2004
->>Originator: Morten Hoegholm
-
-The last three arguments of \@DeclareMathSizes cannot take a dimension
-as argument, making it inconsistent with the rest of the font changing
-commands and itself, as the second argument can take a dimension
-specification.
-\end{verbatim}
-
-\subsection{No hyphenation in first word after float environment (pr/3498)}
-
-\begin{verbatim}
->>Number: 3498
->>Category: latex
->>Synopsis: No hyphenation in first word after float environment
->>Arrival-Date: Thu Jan 30 13:21:00 CET 2003
->>Originator: Harald Harders
-
-If a float environment (figure, table) is written within a paragraph,
-the first word after the environment is not hyphenated.
-\end{verbatim}
-
-\subsection{\texttt{\textbackslash fnsymbol} should use text symbols
- (pr/3400)}
-
-\begin{verbatim}
->>Number: 3400
->>Category: latex
->>Synopsis: \fnsymbol should use text symbols if possible
->>Arrival-Date: Fri Jan 04 20:41:00 CET 2002
->>Originator: Walter Schmidt
-
-The \fnsymbol command can be used in both text and math
-mode. The symbols produced are, however, always taken from
-the math fonts. As a result, they may not match the text
-fonts, even if the symbols are actually available, for
-instance from the TS1 encoding. Since \fnsymbol is
-primarily used for footnotes in text, this should be fixed,
-IMO.
-\end{verbatim}
-
-
-
-
-
-\subsection{\texttt{\textbackslash footnotemark}[x] crashes with fixltx2e.sty
- (pr/3752)}
-
-\begin{verbatim}
->>Number: 3752
->>Category: tools
->>Synopsis: feature \footnotemark[x] crashes with fixltx2e.sty
->>Arrival-Date: Fri Dec 17 10:11:00 +0100 2004
->>Originator: Stefan Pofahl
-
- If I use /fnsymbol together with fixltx2e.sty I can not use
- optional parameter [num]
- \footnotemark[1] is not showing the mark number 1 but
- the mark \value{footnote}.
-\end{verbatim}
-This bug was related to pr/3400, where |\@fnsymbol| was made robust.
-
-\subsubsection{Notes on the implementation strategy}
-
-Pr/3400 made |\@fnsymbol| decide between text-mode and math-mode,
-which requires a certain level of robustness somewhere as the
-decision between text and math must be made at typesetting time and
-not when inside |\protected@edef| or similar commands. One way of
-dealing with this is to make sure the value seen by |\@fnsymbol| is
-a fully expanded number, which could be handled by code such as
-\begin{verbatim}
-\def\fnsymbol#1{\expandafter\@fnsymbol
- \expandafter{\the\csname c@#1\endcsname}}
-\end{verbatim}
-This would be a good solution if everybody used the high level
-commands only by writing code like |\fnsymbol{footnote}|. Unfortunately
-many classes (including the standard classes) and packages use the
-internal forms directly as in |\@fnsymbol\c@footnote| so the easy
-solution of changing |\fnsymbol| would break code that had worked for
-the past 20~years.
-
-Therefore the implementation here makes |\@fnsymbol| itself a
-non-robust command again and instead uses a new robust command
-\DescribeMacro{\TextOrMath}|\TextOrMath|, which will take care of
-typesetting either the math or the text symbol. In order to do so,
-we face an age old problem and unsolvable problem in \TeX: A
-reliable test for math mode that doesn't destroy
-kerning. Fortunately this problem can be solved when using e\TeX\ so
-if you use this as engine for your \LaTeX\ format, as recommended by
-the \LaTeX\ Project, you will get a fully functioning |\TextOrMath|
-command with no side effects. If you use regular \TeX\ as engine for
-your \LaTeX\ format then we have to choose between the lesser of two
-evils: 1)~breaking ligatures and preventing kerning or 2)~face the
-risk of choosing text-mode at the beginning of an alignment cell,
-which was supposed to be math-mode. We have decided upon 1) as is
-customary for regular robust commands in \LaTeX.
-
-
-
-\end{document}