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-rw-r--r--tex/context/base/math-ini.mkiv4
1 files changed, 3 insertions, 1 deletions
diff --git a/tex/context/base/math-ini.mkiv b/tex/context/base/math-ini.mkiv
index 38069eba7..dcd2a5c33 100644
--- a/tex/context/base/math-ini.mkiv
+++ b/tex/context/base/math-ini.mkiv
@@ -1296,7 +1296,9 @@
%D
%D \typebuffer \getbuffer
-\unexpanded\def\mathstylehbox#1%
+% to be tested: {#1} but it could have side effects
+
+\unexpanded\def\mathstylehbox#1% sensitive for: a \over b => {a\over b} or \frac{a}{b}
{\normalexpanded{\hbox\bgroup
\startimath\triggermathstyle\normalmathstyle}\mathsurround\zeropoint#1\stopimath\egroup}