bug#54296: Add buffer-matching functionality

[Eli Zaretskii]

> Date: Wed, 15 Jun 2022 19:51:42 +0300
> Cc: 54296@debbugs.gnu.org, philipk@posteo.net, larsi@gnus.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> On 15.06.2022 19:17, Eli Zaretskii wrote:
> > Did you see that "was" part in what I wrote above?  I was only
> > describing what I meant to say back then, that's all.
> 
> Because your opinion made it into reality.

Sorry about that, but it was a misunderstanding of my opinion.

> Are you going to be fine with me changing 'buffer-match-p' to match the 
> older contract of 'project-kill-buffer-conditions', with both 
> 'major-mode' and 'derived-mode' matchers included?

I don't think I understand what you are suggesting.  What is that
"older contract"?  Can you show a patch?