Hi,
I need some help to identify which XeTeX release fixed
that problem, the mwe is
\catcode`@ 11
\XeTeXinterchartokenstate=1
\newXeTeXintercharclass\french@punctthin
\XeTeXcharclass `\; \french@punctthin
\XeTeXinterchartoks 255 \french@punctthin = {\nobreak\thinspace}%
\catcode`;\active
\def;{\discretionary{\char`\;}{}{\char`\;}}
a;b
\bye
In real life it appeared in a Polyglossia+French context
with the semi-colon make active to insert a \discretionary
similar to the above. There is no issue in lualatex.
It is currently seen at Python upstream (CPython) when
they try to build French docs (via Sphinx)
https://bugs.python.org/issue31589
and it would be nice to pinpoint which XeTeX release
precisely is ok. I know 0.99992 is bad and 0.99996 is good,
but can't easily bisect.
Best,
Jean-François
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