> Instead of using treesit-search-forward, can you use
> treesit-beginning-of-thing or treesit--navigate-thing to do what you want?
> They handle the “child before parent” problem for you, and handles some
> other edge cases.

Thanks, I tried and it works.

Probably treesit--navigate-thing is not internal anymore.
Also the patch below uses treesit--thing-at that doesn't look
internal either.  So maybe two dashes could be removed from names.

Also a remaining question: why treesit-parent-until simply calls
‘(funcall pred node)’ instead of supporting the standard format
that includes a regexp by using treesit-node-match-p?

This causes such an inconvenience that for treesit-outline-level
that uses treesit-parent-until there is a need to wrap a regexp
in a lambda such as for html-ts-mode below.