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-rw-r--r--tex/context/base/mkxl/supp-box.mkxl7
1 files changed, 6 insertions, 1 deletions
diff --git a/tex/context/base/mkxl/supp-box.mkxl b/tex/context/base/mkxl/supp-box.mkxl
index 52f54e327..796c3663a 100644
--- a/tex/context/base/mkxl/supp-box.mkxl
+++ b/tex/context/base/mkxl/supp-box.mkxl
@@ -2681,7 +2681,12 @@
{\beginlocalcontrol\begingroup
\dowithnextboxcs\syst_boxes_contenttostring\hbox}
-\newtoks\everypreroll
+\newtoks \everypreroll
+\newif \ifprerolling
+
+\appendtoks
+ \prerollingtrue
+\to \everypreroll
\let\prerolltostring\firstofoneargument % we need to bypass initializations