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-rw-r--r--macros/latex-dev/required/amsmath/amsmath.dtx31
1 files changed, 28 insertions, 3 deletions
diff --git a/macros/latex-dev/required/amsmath/amsmath.dtx b/macros/latex-dev/required/amsmath/amsmath.dtx
index 05b5168349..7f324700f6 100644
--- a/macros/latex-dev/required/amsmath/amsmath.dtx
+++ b/macros/latex-dev/required/amsmath/amsmath.dtx
@@ -86,7 +86,7 @@ Bug reports can be opened (category \texttt{#1}) at\\%
% \end{macrocode}
%
% \begin{macrocode}
-\ProvidesPackage{amsmath}[2020/08/24 v2.17h AMS math features]
+\ProvidesPackage{amsmath}[2020/09/23 v2.17i AMS math features]
% \end{macrocode}
%
% \section{Catcode defenses}
@@ -615,8 +615,14 @@ Foreign command \@backslashchar#1;\MessageBreak
% abbreviations for some commonly needed mathstyle overrides. To
% conserve csnames we avoid making \cn{dfrac} and \cn{tfrac} robust
% (\cn{genfrac} is itself robust).
+% \changes{v2.17i}{2020/09/23}{added \cs{Ustack} for luatex (moved patch from lualatex-math)}
% \begin{macrocode}
+%
+\ifx\directlua\@undefined
\DeclareRobustCommand{\frac}[2]{{\begingroup#1\endgroup\@@over#2}}
+\else
+\DeclareRobustCommand{\frac}[2]{{\Ustack{\begingroup#1\endgroup\@@over#2}}}
+\fi
\newcommand{\dfrac}{\genfrac{}{}{}0}
\newcommand{\tfrac}{\genfrac{}{}{}1}
% \end{macrocode}
@@ -749,12 +755,12 @@ Foreign command \@backslashchar#1;\MessageBreak
\fi
}
% \end{macrocode}
-%
+% \changes{v2.17i}{2020/09/23}{added \cs{Ustack} (moved patch from lualatex-math)}
% \begin{macrocode}
\DeclareRobustCommand{\genfrac}[6]{{%
\@mathstyle{#4}%
\genfrac@choice o{#1}%
-{\begingroup#5\endgroup\ifx @#3@\@@over\else\@@above\fi#3\relax#6}%
+{\Ustack {\begingroup#5\endgroup\ifx @#3@\@@over\else\@@above\fi#3\relax#6}}%
\genfrac@choice c{#2}%
}}
% \end{macrocode}
@@ -2336,7 +2342,9 @@ Foreign command \@backslashchar#1;\MessageBreak
% for use in a subscript or superscript. At the moment the supported
% arguments are not the full possibilities of \env{array} but only
% |c| or |l| for centered or left-aligned. And only one column.
+% \changes{v2.17i}{2020/09/23}{moved to version from lualatex-math for luatex}
% \begin{macrocode}
+\ifx\directlua\@undefined
\newenvironment{subarray}[1]{%
% \end{macrocode}
% Note: The predecessors of \env{subarray} (\env{Sb} and \env{Sp},
@@ -2375,6 +2383,23 @@ Foreign command \@backslashchar#1;\MessageBreak
}{%
\crcr\egroup\egroup
}
+\else
+\newenvironment{subarray}[1]{%
+ \vcenter\bgroup
+ \Let@ \restore@math@cr \default@tag
+ \baselineskip \Umathstacknumup \scriptstyle
+ \advance\baselineskip \Umathstackdenomdown \scriptstyle
+ \lineskip \Umathstackvgap \scriptstyle
+ \lineskiplimit \lineskip
+ \ialign\bgroup\ifx c#1\hfil\fi
+ \Ustartmath
+ \m@th\scriptstyle##
+ \Ustopmath
+ \hfil\crcr
+}{%
+ \crcr\egroup\egroup
+}
+\fi
% \end{macrocode}
% \end{environment}
%