[tex4ht] With LaTeX 2020-10-01, "\," causes endless loop

[muzimuzhi z]

Hi maintainer(s) of tex4ht,

With LaTeX 2020-10-01, tex4ht raises error

TeX capacity exceeded, sorry [input stack size=5000].

with the following simple example:

\documentclass{article}
\begin{document}
\,
\end{document}


In LaTeX 2020-10-01, definitions of eleven spacing commands are
updated/added, see

https://github.com/latex3/latex2e/issues/303

What is relevant is, "\thinspace" is now let to "\,". But the current
definition of "\,<space>" in latex.4ht (generated from tex4ht-4ht.tex) uses
"\thinspace",

\def\:tempc{\relax\ifmmode\csname a:,\endcsname\else\thinspace\fi}
\expandafter\HLet\csname , \endcsname=\:tempc

Therefore user input "\," now causes endless loop

"\," -> "\,<space>" -> "\thinspace" -> "\,<space>" -> loop

and raises the error "TeX capacity exceeded".

regards,
Yukai
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