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

[Dmitry Gutov]

On 15/12/2022 16:58, Jean Louis wrote:
> * Dmitry Gutov <dgutov@yandex.ru> [2022-12-13 23:32]:
> > > It iterates over results of list-buffers-noselect and among many
> > > buffers finds those Tramp buffers. But why those Tramp buffers start
> > > re-connecting I do not know.
> >
> > So 'M-x list-buffers' or 'C-x C-b' have the same effect? This is not
> > specific to project-list-buffers?
>
> Not, it is specific to project-list-buffers and not to list-buffers.

Then could you explain it in more detail? When you say "It iterates over 
results of list-buffers-noselect", what is "it"? Surely not 
project-list-buffers itself: list-buffers-noselect returns a buffer, not 
a list anyway.

> > > For me this description below is not what that function does, as that
> > > function seem not to select properly. What are project buffers? Are
> > > they not files which are in directories specified as project? It seems
> > > that function is iterating over buffers not necessary to iterate.
> >
> > The answer to what buffers are project buffers is encoded in each project
> > backend's implementation of 'project-buffers'.
> >
> > The default considers non-file buffers as well.
>
> How do I define non-default?

By either redefinining project-vc's project-buffers method, or writing 
your own entire backend.