bug#66993: [PATCH] project.el: avoid asking user about project-list-file lock

[Dmitry Gutov]

On 09/11/2023 13:27, Eli Zaretskii wrote:
> > Date: Thu, 9 Nov 2023 13:05:09 +0200
> > Cc: sbaugh@janestreet.com, 66993@debbugs.gnu.org
> > From: Dmitry Gutov <dmitry@gutov.dev>
> >
> > > Can you tell why the list of projects is saved on a file that is
> > > global among all sessions of the same user?  Would it make sense to
> > > make the file specific to an Emacs process?
> >
> > Specific, meaning in a file name e.g. suffixed with pid?
>
> For example, yes.
>
> > And what happens after the restart? The list needs to be recovered.
>
> Why does it need to be recovered?  Isn't it built on-the-fly anyway?
> Is this just some kind of optimization?

If we didn't need to read it after restart, there would be no point in 
writing the list to disk.

> I guess I don't understand well enough why this file exists and how it
> is used?

Same reason as for savehist-file.