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Re: master 79d9f3982f: Add derived-mode test for bug#24176

From: Lars Ingebrigtsen
Subject: Re: master 79d9f3982f: Add derived-mode test for bug#24176
Date: Tue, 25 Jan 2022 13:16:36 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>>     (defvar mode-a-flk '(("a" 0 'font-lock-keyword-face)))
>>>     (define-derived-mode mode-a fundamental-mode "mode-a"
>>>       (setq-local font-lock-defaults '(mode-a-flk)))
>>>     (define-derived-mode mode-b mode-a "mode-b"
>>>       (font-lock-add-keywords nil `(("b" 0 'font-lock-builtin-face))))
>>>     (defvar mode-c-flk '(("c" 0 'font-lock-keyword-face)))
>>>     (define-derived-mode mode-c mode-b "mode-c"
>>>       (setq-local font-lock-defaults '(mode-c-flk)))
>> And font-lock-keywords should then be...
>> (t (("c" 0 'font-lock-keyword-face)))?
> I think so, yes, or maybe b+c, but it definitely should not be a+b.

Hm...  do you see any obvious way to fix this?  We could document that
you have to set font-lock-set-defaults to nil if you're setting
font-lock-defaults in a derived mode, but that's not very
satisfactory...  or we could store the value of font-lock-defaults and
check whether it's changed (in font-lock-set-defaults)?  Hm...

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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