bug#62974: 29.0.60; New buffers created with project-switch-to-buffer aren't in the project

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 21 Apr 2023 02:55:47 +0300
> Cc: 62974@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 20/04/2023 21:55, Eli Zaretskii wrote:
> >> From: Spencer Baugh<sbaugh@janestreet.com>
> >> Date: Thu, 20 Apr 2023 14:37:26 -0400
> >>
> >>
> >> 1. emacs -Q (in a directory not in a project)
> >> 2. Note current default-directory: some/dir
> >> 3. C-x p b (so that it will prompt for a project)
> >> 4. Select some project and RET
> >> 5. Enter a nonexisting buffer name and RET
> >> 6. The new buffer's default-directory is some/dir
> >>
> >> Expected behavior:
> >> 6. The new buffer's default-directory is the project root of the project
> >> you picked.
> > ??Really?  project.el changes the way Emacs creates new buffers?  Is
> > there a reason for such a deviation (if indeed there is a deviation)?
> > Because otherwise my expectation would exactly what you see, because
> > "C-x b" behaves like that.
> 
> Perhaps the idea is that the newly created buffer will be considered as 
> belonging to the project right away?

But if it is in a subdirectory of the root, it also belongs to the
project, doesn't it?  Exactly like the buffer from which this command
is invoked, whose default-directory was a subdirectory of the root.
No?