bug#65580: [PATCH] ; * lisp/help-fns.el (help-do-arg-highlight): Fix regexp.

[Stefan Kangas]

Version: 30.1

> This patch addresses the following existing issue:
>
> In the output of `C-h f with-delayed-message RET`, the word `message` in
> the function name is incorrectly highlighted with `help-argument-name`.
>
> This can be seen also with a definition such as:
>
> --8<---------------cut here---------------start------------->8---
> (defun foo-bar (baz)
>     "Frobnicate BAZ.
>
> \(fn (foo bar))"
>   nil)
> --8<---------------cut here---------------end--------------->8---
>
> Now `C-h f foo-bar RET` shows both `foo` and `bar` in the function name
> with `help-argument-name` (as well as the `foo` and `bar` arguments).
>
> The attached patch tweaks the regular expression that
> `help-do-arg-highlight` uses to find argument occurrences such that it
> skips the function name.

Thanks, pushed to master.