bug#67462: 30.0.50; prog-fill-reindent-defun does not respect buffer-local fill-paragraph-function

[Jens Schmidt via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Jens Schmidt <jschmidt4gnu@vodafonemail.de>
>> Cc: 67462@debbugs.gnu.org,  dmitry@gutov.dev
>> Date: Mon, 27 Nov 2023 21:08:32 +0100
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> >
>> > What would it take to teach prog-fill-reindent-defun to DTRT outside
>> > comments and strings?
>
> (I meant "inside", sorry.)
>
>> IMO the problem here is that some modes already have an idea of what
>> could be TRT outside comments and strings, implemented in a
>> mode-specific fill-paragraph-function.
>
> But isn't filling inside comments and strings basically very similar
> in these modes?

You lost me here, sorry.

*Inside* comments and strings I don't see any issues: In these the
result of M-q should be identical before or after commit b889eced4449
introduced function `prog-fill-reindent-defun'.  Because inside comment
and strings `prog-fill-reindent-defun' just forwards to
`fill-paragraph'.

It's outside comment and strings where behavior can differ.  Or where
behavior actually differs, as shown in my initial report.