Since version 0.044: U+0332 “Combining Low Line” typeset wrong after math alphanumerics by XeLaTeX and LuaLaTeX

[anderslundstedt]

\documentclass{article}
\usepackage{fontspec}
\setmainfont[Path = ./,]{JuliaMono-Regular}
\begin{document}
n̲ = 𝘮̲

x̲ = 𝛼̲
\end{document}

The above saved as test.tex and compiled with xelatex test.tex, or lualatex test.tex produces my intended output with version 0.043 and also with some earlier versions I tested:

With version 0.044:

The input for n̲, 𝘮̲, x̲, 𝛼̲ was, respectively:

• n + u+0332
• u+1D62E + u+0332
• x + u+0332
• u+1D6FC + u+0332

u+0332 is “Combining Low Line“:

https://www.compart.com/en/unicode/U+0332

Everything looks good in TextEdit:

So perhaps a problem with XeLaTex and LuaLaTeX, or with fontspec?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions!

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions!

[anderslundstedt]

I have debugged this a bit, and have a workaround (that at least worked for version 0.045). I will post more info when I have time, but on the off chance that someone else wants to look into this, let me know and I will do my best to find time to share my findings.

[anderslundstedt]

\documentclass{article}
\usepackage{fontspec}
\setmainfont[Path = ./,]{JuliaMono-Regular}
\begin{document}
n̲ = 𝘮̲

x̲ = 𝛼̲
\end{document}

Just tested this MWE with the latest version (0.046) and now it is typeset correctly. During my debugging I discovered some related issues with glyphs for characters from the Combining Diacritical Marks block, so perhaps keep this issue open until I have had time to revisit all my test cases?

[github-actions[bot]]

This issue has been open for 30 days with no activity.