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Compile this with xetex

\XeTeXinterchartokenstate=1
\XeTeXcharclass `' = 5
\XeTeXinterchartoks 5 3={\empty}
''。\par
\XeTeXinterchartoks 5 3={}
''。\par
\bye

will get

enter image description here.

An empty macro disables the ligatue, but in xelatex

\documentclass{article}
\begin{document}
\XeTeXinterchartokenstate=1
\XeTeXcharclass `' = 5
\XeTeXinterchartoks 5 3={\empty}
''。\par
\XeTeXinterchartoks 5 3={}
''。\par
\end{document}

then I get the correct quotation mark.

enter image description here

Improve this question
2
  • I know it's lmroman, but why does cmr have the first ligatue but not the other?
    – Tuff Contender
    Commented Feb 20, 2022 at 18:35
  • Legacy fonts are treated differently from OpenType ones. In the XeLaTeX example the ligature is formed before the next character 。 is examined, due to mapping=tex-text.
    – egreg
    Commented Feb 20, 2022 at 20:47

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