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

[Dmitry Gutov]

On 10/12/2022 10:11, Eli Zaretskii wrote:
> I'm not following.  Are you saying that the problem is that the
> FILTER-PREDICATE argument to list-buffers-noselect calls
> project-buffers for each buffer?

Yes.

> If so, I don't understand why a
> trivial change to project-list-buffers could not call project-buffers
> just once, and then reuse the value in the call to
> list-buffers-noselect both as the BUFFER-LIST argument and (if needed)
> in the FILTER-PREDICATE argument, using memq.

If we just do that, pressing 'g' will only show the buffers that 
belonged to the project when project-list-buffers was called. And not 
necessarily the *current* list of project buffers.

The previously attached patches solved that problem.