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+Release notes for AUCTeX 13.1 with preview-latex
+================================================
+
+AUCTeX provides by far the most wide-spread and sophisticated
+environment for editing LaTeX, TeX, ConTeXt and Texinfo documents with
+Emacs. Combined with packages like RefTeX, flyspell and others it is
+pretty much without peer as a comprehensive authoring solution for a
+large variety of operating system platforms and TeX distributions. It
+supports document-dependent completion and syntax highlighting, easily
+accessible menus, jumping to error locations in the source file, a
+number of editing shortcuts, intelligent indentation and filling of
+text during entry, and WYSIWYG previews of graphical elements like
+math formulas right in the Emacs source buffer, by virtue of its
+preview-latex component.
+
+One part of the preview-latex subsystem is the central `preview.sty'
+file that is independently useful for a number of applications and is
+available in unbundled form from CTAN.[1]
+
+AUCTeX needs volunteers in particular for non-programming tasks:
+documentation writing, tutorials, translations, reference material,
+sleuth work, testing.
+
+New features and fixed bugs in this release
+-------------------------------------------
+
+In math environments 'gather', 'gather*', 'gathered', 'multline'
+and 'multline*', fill commands such as 'M-q' and 'C-c C-q C-e' are
+disabled. This sorts out the inconsistency between those and
+'equation', 'displaymath' environments, in latter of which filling
+is already disabled.
+
+If you want filling in such environments, customize
+'LaTeX-indent-environment-list' to remove them.
+
+Auto fill continues to work in such environment anyway.
+
+In addition, AUCTeX adds support of alignment at '&' sign in
+'align'-like environments such as 'alignat', 'aligned' and so on,
+as well as 'matrix'-like environments such as 'pmatrix', 'bmatrix'
+and so on.
+
+Now two commands 'Texindex' and 'Texi2dvi' are available when you
+type 'C-c C-c' in Texinfo mode. The command 'Texindex' runs
+'texindex' on index files and 'Texi2dvi' runs 'pdftexi2dvi' or
+'texi2dvi' according to the value of 'TeX-PDF-mode'.
+
+So you can typeset Texinfo documents into PDF or DVI format from
+within AUCTeX.
+
+AUCTeX's own help messages for LaTeX errors are now shown only for
+LaTeX runs. AUCTeX shows raw error/warning messages found in
+'.log' files for runs of formats other than LaTeX, such as plain
+TeX, ConTeXt and Texinfo, as it does even for LaTeX runs when it
+can't find a matching entry in its own help message catalogue.
+
+Due to this change, customize option 'TeX-error-description-list'
+can no longer have a fallback entry that matches any error. If
+your customized value includes such entry, typically '(".*" . "No
+help available")', please remove it.
+
+Two functions 'TeX-split-string' and 'TeX-assoc' are now obsolete
+and will be removed in future release. If your personal code uses
+these functions, use 'split-string' and 'assoc-string' instead.
+
+The function 'TeX-read-key-val' now accepts a function call as
+second argument. This change should help AUCTeX style writers who
+use 'TeX-arg-key-val' and have to deal with dynamic key-values.
+Example of usage:
+ (TeX-add-style-hook "foo"
+ (lambda ()
+ (TeX-add-symbols
+ '("bar" (TeX-arg-key-val (function-returning-key-val))))))
+
+Since AUCTeX 12.2, 'C-x C-w' accidentally disabled the parse on
+save in that buffer, even when you enabled 'TeX-auto-save' option.
+This bug was fixed.
+
+AUCTeX now requires GNU Emacs 24.3 or higher.
+
+Old implementations for viewers were discarded, as announced long
+before. The variables 'TeX-output-view-style' and 'TeX-view-style'
+have no effect now. The former placeholders '%v' and '%vv' in
+'TeX-command-list' are ignored.
+
+AUCTeX now uses lexical binding which has been introduced in Emacs
+24. This change should have no user-visible effect and require no
+manual adaptions except in the following cases.
+
+ - Entries added to the customization variable 'TeX-expand-list'
+ also had access to variables 'command' and 'pos'. Those are
+ now properly declared and named 'TeX-expand-command' and
+ 'TeX-expand-pos'.
+
+ - Entries added to the customization variable 'TeX-expand-list'
+ had access to a variable 'file' which was bound to
+ 'TeX-active-master', i.e., it evaluated to either the master
+ or region file. This usage must be replaced with either
+ 'TeX-active-master' or 'TeX-active-master-with-quotes'.
+
+ - Viewer entries in 'TeX-view-program-list' also had access to a
+ variable 'file' which was bound to the name of the master or
+ region file without extension. Instead, the function
+ 'TeX-active-master' has to be used now.
+
+ - Macro argument parsing functions could set a variable
+ 'exit-mark' to the buffer position where point should be left
+ after all arguments have been read. This variable is now
+ named 'TeX-exit-mark'.
+
+ - The functions in 'LaTeX-section-hook' had access or modified
+ the previously undeclared variables 'title', 'name', 'level',
+ 'done-mark', and 'toc'. These variables are now properly
+ declared and have the 'LaTeX-' prefix, e.g.,
+ 'LaTeX-done-mark'.
+
+ - The functions in 'ConTeXt-numbered-section-hook' and
+ 'ConTeXt-unnumbered-section-hook' had access or modified the
+ previously undeclared variables 'title', 'name', 'level',
+ 'done-mark', and 'reference'. These variables are now
+ properly declared and have the 'ConTeXt-' prefix, e.g.,
+ 'ConTeXt-title'.
+
+ - The functions in 'TeX-translate-location-hook' could access
+ and modify the free variables 'file', 'line', 'error',
+ 'offset', 'context', and 'string'. Those are now properly
+ declared variables with the prefix 'TeX-translate-location-',
+ e.g., 'TeX-translate-location-file'.
+
+The constant 'LaTeX-dialect' has been renamed to 'TeX-dialect' and
+moved from 'latex.el' to 'tex.el'. 'LaTeX-dialect' now is an
+obsolete alias.
+
+The style 'latexinfo.el' is removed from AUCTeX. 'latexinfo.el'
+was meant to support latexinfo which in return was a LaTeX-2.09
+extension of Texinfo, but didn't manage to replace Texinfo.
+
+The style 'siunitx.el' is updated to support package version 3.
+Key-value options provided by older package versions are removed,
+deprecated macros and units are not supported anymore.
+
+AUCTeX has preliminary support for LaTeX-hooks. Hooks provided by
+LaTeX kernel are known and available for completion in
+'\AddToHook', '\RemoveFromHook' and '\AddToHookNext'.
+
+AUCTeX is now able to place all generated output files, including
+those that are produced by applications running under AUCTeX,
+temporary files related to region processing and preview-latex
+files, in an output directory. To use this feature, set the new
+user option 'TeX-output-dir' to the absolute path of the output
+directory or a relative path which would be interpreted as being
+relative to the master file in a multifile document.
+
+Note that this feature doesn't work if the document includes sub
+file placed in sub directory below the main file via '\include'
+command.
+
+Many other bugs were fixed.
+
+Requirements
+------------
+
+It is required that you use at least GNU Emacs 24.3.
+
+The preview-latex subsystem requires image support.
+
+You'll also need a working LaTeX installation and Ghostscript.
+dvipng[2] (version 1.4 or later), a very fast DVI converter, can be
+used to speed up the conversion.
+
+Availability
+------------
+
+The easiest way for getting AUCTeX is installing it with GNU ELPA, see
+<URL:https://elpa.gnu.org/packages/auctex.html> for more information.
+Other download options are available at
+<URL:https://ftp.gnu.org/gnu/auctex/>. At release time, we provide the
+source tarball. You can also use versions of Emacs that already
+include AUCTeX or a software package management system for your
+operating system which provides you with the latest release.
+
+A separate directory for each release contains some stuff from the
+tarball, such as ChangeLog, printable manuals, and a reference sheet.
+The download area is mirrored to the directory support/auctex on CTAN.
+AUCTeX is licensed under the GNU General Public License version 3.
+
+You'll find more information at the web site of AUCTeX
+<URL:https://www.gnu.org/software/auctex/>, including its mailing list
+addresses.
+
+Future development and additional information
+---------------------------------------------
+
+AUCTeX is proceeding as a GNU project with the long-term intent of
+merging it into Emacs. For that reason, all new contributors need to
+assign copyright to their contributions to the FSF (the usual
+procedure for Emacs contributors). The same holds for past
+contributors. The principal authors and maintainers have already done
+so, but it would require a diligent and diplomatic volunteer to find
+and ask the rest.
+
+Current AUCTeX managers are Arash Esbati, Mosè Giordano, and Tassilo
+Horn. Everybody is welcome to contribute to the project by reporting
+bugs and suggesting improvements, but the most effective way of
+helping AUCTeX development remains volunteering for tasks.
+
+The following people contributed to this release series (in
+alphabetical order): Ivan Andrus, Ralf Angeli, Masayuki Ataka,
+Mohammad Hossein Bateni, Fabrice Ben Hamouda, Thomas Baumann, Vincent
+Belaïche, Berend de Boer, Alex Branham, Uwe Brauer, Ken Brown, Joshua
+Buhl, Jean-François Burnol, Patrice Dumas, Arash Esbati, Werner Fink,
+Miguel Frasson, Peter S. Galbraith, Mosè Giordano, Andrea Greselin,
+Patrick Gundlach, Abdul-Lateef Haji-Ali, Jobst Hoffmann, Tassilo Horn,
+Yvon Hevel, Orlando Iovino, Mads Jensen, Arne Jĝrgensen, Philip
+Kaludercic, David Kastrup, Ikumi Keita, Philip Kime, Oleh Krehel,
+Joost Kremers, Frank Küster, Jan-Ċke Larsson, Matthew Leach, Brian
+Leung, Antoine Levitt, Leo Liu, Vladimir Lomov, Stefan Monnier, Dan
+Nicolaescu, Piet van Oostrum, Pieter Pareit, Nicolas Richard, Augusto
+Ritter Stoffel, Florent Rougon, Santiago Saavedra, Davide
+G. M. Salvetti, Rüdiger Sonderfeld, Holger Sparr, Mike Sperber, Reiner
+Steib, Christian Schlauer, Shiro Takeda, Mark Trettin (Please accept
+our apologies if we forgot somebody.)
+
+Footnotes:
+
+[1] <URL:https://www.ctan.org/pkg/preview>
+
+[2] dvipng is available via its project page
+<URL:https://savannah.nongnu.org/projects/dvipng> and from CTAN.