bug#24176: Confusing interaction between define-derived-mode and font-lock-add-keywords

[Lars Ingebrigtsen]

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

>> Stefan, is this working as designed?
>
> Not really, no.  The design didn't take this into account at least.
>
>> If so, the behaviour should perhaps be mentioned in the doc for
>> font-lock-add-keywords and/or define-derived-mode?
>
> I think it'd be better to fix it ;-)

I think I've fixed this in Emacs 29.

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