Ulrike Fischer wrote:
different code pathes in xetex - cmr10 is not handled by harfbuzz.
Thank you, Ulrike — I never knew that. New demonstration file follows :
% !TeX Program=XeTeX
\hsize = 1 mm
\def \doit #1%
{%
\leftline {#1}
\hyphenchar \font = "200B
a aa^^^^200baa
a
aaaa
\par
}
\doit {Default font: cmr10}
\font \thisfont = "LMRoman10-Regular"
\thisfont
\doit {"LMRoman10-Regular"}
\font \thisfont = "BKM-cmr10"
\thisfont
\doit {"BKM-cmr10"}
\end
