Take care of commands like `\tilde␣`

[muzimuzhi]

Description

unicode-math redefines math commands like \tilde from

macro:->\protect \tilde␣

to

\protected macro:->...

And if user does not explicitly use \setmathfont in preamble, the above redefinition takes place at begin document. But in some cases, commands like \title are expanded at preamble (thus before begin document). This can be solved by using \protect\tilde, but protecting a robust command is not so straightforward.

It would be better that unicode-math will update the definition of commands like tilde␣ inside \setmathfont.

Add info or delete as appropriate:

• Relevant for XeTeX
• Relevant for LuaTeX
• Issue tracker has been searched for similar issues.
• Links to discussion: Conflict between unicode-math and glossaries-extra

Minimal example demonstrating the issue

\documentclass[12pt]{article}
\usepackage{unicode-math}

\makeatletter
\protected@xdef\cmd{\tilde}
\makeatother

\begin{document}
\[
  \cmd{D},  % tilde accent is at wrong position. 
            % equivalent to \protect \tilde␣{D}
  \tilde{D}
\]
\end{document}