bug#39354: enhancement request: hideshow should handle derived modes

[Lars Ingebrigtsen]

Tobias Zawada <i_inbox@tn-home.de> writes:

> hideshow.el should handle derived modes.
> See discussion on emacs.SE about hideshow in sage-shell-mode (link: 
> https://emacs.stackexchange.com/questions/55129/hs-minor-mode-and-sage-shell-mode-derived-from-python-mode#comment86297_55129).
>
> I propose following change on `hs-grok-mode-type` (perma-link:
> https://github.com/jwiegley/emacs-release/blob/adfd5933358fdf6715423dee8169eb3cd7d982db/lisp/progmodes/hideshow.el#L666):

[...]

> -      (let* ((lookup (assoc major-mode hs-special-modes-alist))
> +      (let* ((lookup (cl-assoc-if (lambda (mode)
> +                                 (derived-mode-p major-mode mode))
> +                               hs-special-modes-alist))

Makes sense to me, so I've applied your patch to Emacs 28.

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