From b2ba0afced5c10391750914c16a2aa06cfaa6a96 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Sun, 22 Jan 2017 23:37:33 +0000
Subject: latex2e (22jan17)

git-svn-id: svn://tug.org/texlive/trunk@43024 c570f23f-e606-0410-a88d-b1316a301751
---
 Master/texmf-dist/tex/latex/amsmath/amsmath.sty | 86 +++++++++++++++++++++++--
 1 file changed, 82 insertions(+), 4 deletions(-)

(limited to 'Master/texmf-dist/tex/latex/amsmath')

diff --git a/Master/texmf-dist/tex/latex/amsmath/amsmath.sty b/Master/texmf-dist/tex/latex/amsmath/amsmath.sty
index 2b82aeaaac8..6835f3ce120 100644
--- a/Master/texmf-dist/tex/latex/amsmath/amsmath.sty
+++ b/Master/texmf-dist/tex/latex/amsmath/amsmath.sty
@@ -23,7 +23,7 @@
 %% 
 \NeedsTeXFormat{LaTeX2e}% LaTeX 2.09 can't be used (nor non-LaTeX)
 [1994/12/01]% LaTeX date must be December 1994 or later
-\ProvidesPackage{amsmath}[2016/06/28 v2.15d AMS math features]
+\ProvidesPackage{amsmath}[2016/11/05 v2.16a AMS math features]
 \edef\@temp{\catcode 96=\number\catcode 96 }
 \catcode\string `\`=12
 \def\do#1{\catcode\number`#1=\number\catcode`#1}
@@ -71,8 +71,22 @@
         \fi
     }%
 }
+\DeclareOption{alignedleftspaceyes}{\def\alignedspace@left{\null\,}}
+\DeclareOption{alignedleftspaceno}{\def\alignedspace@left{\null}}
+\DeclareOption{alignedleftspaceyesifneg}{%
+\def\alignedspace@left{%
+  \edef\@tempa{\expandafter\@car\the\lastskip\@nil}%
+  \if-\@tempa\null\,%
+  \else
+    \edef\@tempa{\expandafter\@car\the\lastkern\@nil}%
+    \if-\@tempa\null\,%
+    \else\null
+    \fi
+  \fi}%
+}
 \DeclareOption{?}{}
-\ExecuteOptions{nointlimits,sumlimits,namelimits,centertags}
+\ExecuteOptions{%
+  nointlimits,sumlimits,namelimits,centertags,alignedleftspaceyesifneg}
 \ProcessOptions\par
 \@ifpackagewith{amsmath}{?}{%
   \typeout{^^J%
@@ -202,12 +216,76 @@ Foreign command \@backslashchar#1;\MessageBreak
 \DeclareRobustCommand{\binom}{\genfrac()\z@{}}
 \newcommand{\dbinom}{\genfrac(){0pt}0}
 \newcommand{\tbinom}{\genfrac(){0pt}1}
+\ifx\directlua\@undefined
+\ifx\XeTeXcharclass\@undefined
 \DeclareRobustCommand{\genfrac}[4]{%
   \def\@tempa{#1#2}%
   \edef\@tempb{\@nx\@genfrac\@mathstyle{#4}%
     \csname @@\ifx @#3@over\else above\fi
     \ifx\@tempa\@empty \else withdelims\fi\endcsname}
   \@tempb{#1#2#3}}
+\else
+\def\genfrac@rule#1#2#3#4{%
+\hbox{$\left#1\vcenter{\hrule \@width\z@
+                       \@height
+                       \ifdim\fontdimen#2#3\tw@=\z@
+                       #4\fontdimen6#3\tw@
+                       \else
+                       \fontdimen#2#3\tw@
+                       \fi
+                      }\right.$}}
+\def\genfrac@choice#1#2{%
+\ifx @#2@\else
+{\delimitershortfall\z@\delimiterfactor\@m
+ \mathsurround\z@\nulldelimiterspace\z@
+\ifx c#1\kern-\nulldelimiterspace\fi
+\mathchoice
+{\genfrac@rule{#2}{20}\textfont{2.39}}%
+{\genfrac@rule{#2}{21}\textfont{1}}%
+{\genfrac@rule{#2}{21}\scriptfont{1.45}}%
+{\genfrac@rule{#2}{21}\scriptscriptfont{1.35}}%
+}%
+\ifx o#1\kern-\nulldelimiterspace\fi
+\fi
+}
+\DeclareRobustCommand{\genfrac}[6]{{%
+\@mathstyle{#4}%
+\genfrac@choice o{#1}%
+{\begingroup#5\endgroup\ifx @#3@\@@over\else\@@above\fi#3\relax#6}%
+\genfrac@choice c{#2}%
+}}
+\fi
+\else
+\def\genfrac@rule#1#2#3{%
+\hbox{$\left#1\vcenter{\hrule \@width\z@
+                       \@height
+                       \ifdim\Umathfractiondelsize#2=\z@
+                       #3\fontdimen6#3\tw@
+                       \else
+                       \Umathfractiondelsize#2%
+                       \fi
+                      }\right.$}}
+\def\genfrac@choice#1#2{%
+\ifx @#2@\else
+{\delimitershortfall\z@\delimiterfactor\@m
+ \mathsurround\z@\nulldelimiterspace\z@
+\ifx c#1\kern-\nulldelimiterspace\fi
+\mathchoice
+{\genfrac@rule{#2}\displaystyle{2.39}}%
+{\genfrac@rule{#2}\textstyle{1}}%
+{\genfrac@rule{#2}\scriptstyle{1.45}}%
+{\genfrac@rule{#2}\scriptscriptstyle{1.35}}%
+}%
+\ifx o#1\kern-\nulldelimiterspace\fi
+\fi
+}
+\DeclareRobustCommand{\genfrac}[6]{{%
+\@mathstyle{#4}%
+\genfrac@choice o{#1}%
+{\begingroup#5\endgroup\ifx @#3@\@@over\else\@@above\fi#3\relax#6}%
+\genfrac@choice c{#2}%
+}}
+\fi
 \def\@genfrac#1#2#3#4#5{{#1{\begingroup#4\endgroup#2#3\relax#5}}}
 \def\@mathstyle#1{%
   \ifx\@empty#1\@empty\relax
@@ -1264,7 +1342,7 @@ and fix things up.}
         \nonmatherr@{\begin{\@currenvir}}%
     \fi
     \savecolumn@ % Assumption: called inside a group
-    \null\,%
+    \alignedspace@left
     \if #1t\vtop \else \if#1b \vbox \else \vcenter \fi \fi \bgroup
         \maxfields@#2\relax
         \ifnum\maxfields@>\m@ne
@@ -1328,7 +1406,7 @@ and fix things up.}
     \RIfM@\else
         \nonmatherr@{\begin{gathered}}%
     \fi
-    \null\,%
+    \alignedspace@left
     \if #1t\vtop \else \if#1b\vbox \else \vcenter \fi\fi \bgroup
         \Let@ \chardef\dspbrk@context\@ne \restore@math@cr
         \spread@equation
-- 
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