Renaming Commands fails when they occur with subscript

[svdwall]

\documentclass{article}

\newcommand{\asd}{asd}

\begin{document}
$\asd_{\asd}$
\end{document}

Invoking rename from \asd into \asda results in

\documentclass{article}

\newcommand{\asda}{asd}

\begin{document}
$\asd_{\asda}$
\end{document}

So the \asd_ was not changed to \asda_.

When I scrolled through the code I found this part, which I believe might cause the \asd_ to be considered a different command than \asd.

texlab/crates/parser/src/latex/lexer/types.rs

Lines 77 to 78 in 102699b

	'@' | ':' | '_' => {
	lexer.bump(c.len_utf8());