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

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Cc: dmitry@gutov.dev,  66993@debbugs.gnu.org
> Date: Wed, 08 Nov 2023 12:05:38 -0500
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> >
> > Not sure I follow: userlock.el signals a very specific error, doesn't
> > it?  Or what am I missing?
> 
> By that you mean file-locked?  It only signals file-locked if it first
> prompts the user, which is what we want to avoid.  If noninteractive=t,
> then it just signals error:
> 
> (if noninteractive (error "Cannot resolve lock conflict in batch mode"))

And that is not specific enough?

And why the noninteractive=t case is relevant here, btw?

> Possibly we should just change that to signal file-locked too.

Or something else.  If needed.

In any case, these are minor details, the main point is that this
error can be caught.