1 files changed, 32 insertions, 2 deletions
diff --git a/tex/context/base/supp-mat.mkiv b/tex/context/base/supp-mat.mkiv
index f77ee3454..925f25cc4 100644
--- a/tex/context/base/supp-mat.mkiv
+++ b/tex/context/base/supp-mat.mkiv
@@ -53,6 +53,36 @@
 \let\normalstartdmath  \Ustartdisplaymath
 \let\normalstopdmath   \Ustopdisplaymath
 
+% \unexpanded\def\Ustartdisplaymath
+%   {\ifinner
+%      \ifhmode
+%        \normalUstartmath
+%        \let\Ustopdisplaymath\normalUstopmath
+%      \else
+%        \normalUstartdisplaymath
+%        \let\Ustopdisplaymath\normalUstopdisplaymath
+%      \fi
+%    \else
+%      \normalUstartdisplaymath
+%      \let\Ustopdisplaymath\normalUstopdisplaymath
+%    \fi}
+
+\unexpanded\def\Ucheckedstartdisplaymath
+  {\ifinner
+     \ifhmode
+       \normalUstartmath
+       \let\Ucheckedstopdisplaymath\normalUstopmath
+     \else
+       \normalUstartdisplaymath
+       \let\Ucheckedstopdisplaymath\normalUstopdisplaymath
+     \fi
+   \else
+     \normalUstartdisplaymath
+     \let\Ucheckedstopdisplaymath\normalUstopdisplaymath
+   \fi}
+
+\let\Ucheckedstopdisplaymath\relax
+
 \def\normalmathaligntab{&} % \let\normalmathaligntab\aligntab does to work well in a let to & (a def works ok)
 
 \let\normalsuper       \Usuperscript       % obsolete
@@ -60,8 +90,8 @@
 
 \let\startimath        \Ustartmath
 \let\stopimath         \Ustopmath
-\let\startdmath        \Ustartdisplaymath
-\let\stopdmath         \Ustopmath
+\let\startdmath        \Ustartdisplaymath  % \Ucheckedstartdisplaymath
+\let\stopdmath         \Ustopdisplaymath   % \Ucheckedstopdisplaymath
 
 \unexpanded\def\mathematics#1{\relax         \ifmmode#1\else\normalstartimath#1\normalstopimath\fi}
 \unexpanded\def\displaymath#1{\noindent      \ifmmode#1\else\normalstartdmath#1\normalstopdmath\fi}