Merge pull request #9949 from jfbu/9925_latex

LaTeX: prohibit also with xelatex linebreaks at dashes in literal text (not code-blocks) (fixes #9925)

CHANGES

@@ -36,6 +36,8 @@ Bugs fixed
 * #9878: mathjax: MathJax configuration is placed after loading MathJax itself
 * #9857: Generated RFC links use outdated base url
 * #9909: HTML, prevent line-wrapping in literal text.
+* #9925: LaTeX: prohibit also with ``'xelatex'`` line splitting at dashes of
+  inline and parsed literals
 
 Testing
 --------

sphinx/texinputs/sphinxlatexliterals.sty

@@ -1,7 +1,7 @@
 %% LITERAL BLOCKS
 %
 % change this info string if making any custom modification
-\ProvidesFile{sphinxlatexliterals.sty}[2021/01/27 code-blocks and parsed literals]
+\ProvidesFile{sphinxlatexliterals.sty}[2021/12/06 code-blocks and parsed literals]
 
 % Provides support for this output mark-up from Sphinx latex writer:
 %
@@ -704,6 +704,10 @@
 % the \catcode13=5\relax (deactivate end of input lines) is left to callers
 \newcommand*{\sphinxunactivateextrasandspace}{\catcode32=10\relax
       \sphinxunactivateextras}%
+% alltt uses a monospace font and linebreaks at dashes (which are escaped
+% to \sphinxhyphen{} which expands to -\kern\z@) are inhibited with pdflatex.
+% Not with xelatex (cf \defaultfontfeatures in latex writer), so:
+\newcommand*{\sphinxhypheninparsedliteral}{\sphinxhyphennobreak}
 % now for the modified alltt environment
 \newenvironment{sphinxalltt}
 {% at start of next line to workaround Emacs/AUCTeX issue with this file
@@ -711,6 +715,7 @@
  \ifspx@opt@parsedliteralwraps
    \sbox\sphinxcontinuationbox {\spx@opt@verbatimcontinued}%
    \sbox\sphinxvisiblespacebox {\spx@opt@verbatimvisiblespace}%
+   \let\sphinxhyphen\sphinxhypheninparsedliteral
    \sphinxbreaksattexescapedchars
    \sphinxbreaksviaactiveinparsedliteral
    \sphinxbreaksatspaceinparsedliteral
@@ -757,10 +762,14 @@
 \protected\def\sphinxtextbackslashbreakafter
  {\discretionary{\sphinx@textbackslash}{\sphinxafterbreak}{\sphinx@textbackslash}}
 \let\sphinxtextbackslash\sphinxtextbackslashbreakafter
+% - is escaped to \sphinxhyphen{} and this default ensures no linebreak
+% behaviour (also with a non monospace font, or with xelatex)
+\newcommand*{\sphinxhyphenininlineliteral}{\sphinxhyphennobreak}
 % the macro must be protected if it ends up used in moving arguments,
 % in 'alltt' \@noligs is done already, and the \scantokens must be avoided.
 \protected\def\sphinxupquote#1{{\def\@tempa{alltt}%
   \ifx\@tempa\@currenvir\else
+   \let\sphinxhyphen\sphinxhyphenininlineliteral
    \ifspx@opt@inlineliteralwraps
       % break at . , ; ? ! /
       \sphinxbreaksviaactive

sphinx/texinputs/sphinxlatexstyletext.sty

@@ -1,7 +1,7 @@
 %% TEXT STYLING
 %
 % change this info string if making any custom modification
-\ProvidesFile{sphinxlatexstyletext.sty}[2021/01/27 text styling]
+\ProvidesFile{sphinxlatexstyletext.sty}[2021/12/06 text styling]
 
 % Basically everything here consists of macros which are part of the latex
 % markup produced by the Sphinx latex writer
@@ -72,12 +72,20 @@
 
 % Special characters
 %
-% This definition prevents en-dash and em-dash TeX ligatures.
+% The \kern\z@ is to prevent en-dash and em-dash TeX ligatures.
+% A linebreak can occur after the dash in regular text (this is
+% normal behaviour of "-" in TeX, it is not related to \kern\z@).
 %
-% It inserts a potential breakpoint after the hyphen. This is to keep in sync
-% with behavior in code-blocks, parsed and inline literals. For a breakpoint
-% before the hyphen use \leavevmode\kern\z@- (within \makeatletter/\makeatother)
+% Parsed-literals and inline literals also use the \sphinxhyphen
+% but linebreaks there are prevented due to monospace font family.
+% (xelatex needs a special addition, cf. sphinxlatexliterals.sty)
+%
+% Inside code-blocks, dashes are escaped via another macro, from
+% Pygments latex output (search for \PYGZhy in sphinxlatexliterals.sty),
+% and are configured to allow linebreaks despite the monospace font.
+% (the #1 swallows the {} from \sphinxhyphen{} mark-up)
 \protected\def\sphinxhyphen#1{-\kern\z@}
+\protected\def\sphinxhyphennobreak#1{\mbox{-}}
 % The {} from texescape mark-up is kept, else -- gives en-dash in PDF bookmark
 \def\sphinxhyphenforbookmarks{-}