bug#59935: 29.0.60; project-list-buffers is slow

[Dmitry Gutov]

On 11/12/2022 21:00, Eli Zaretskii wrote:
> > Otherwise, this change could be split into two steps:
> >
> > - Rollback that signature to pre-commit 125b5684c (i.e. revert its part
> > in buff-menu.el). This is something we usually considered to be safe.
> >
> > - Add new change that allows BUFFER-LIST to be a function.
> We can do it safer, so I'd prefer that.

I don't like that idea because we'll leave an unproven new feature in 
the codebase, without any known callers or requestors. That's just extra 
complexity, with all associated long-term costs.

But you're the boss. It's better to fix this than not, obviously.