bug#64062: Emacs 29.0.91: With enable-recursive-minibuffers, C-x b foo splits the window.

[Eli Zaretskii]

> Cc: 64062@debbugs.gnu.org
> Date: Wed, 14 Jun 2023 10:58:39 +0000
> From: Gregory Heytings <gregory@heytings.org>
> 
> > emacs -Q
> > M-: (setq enable-recursive-minibuffers t)
> > M-x
> > C-x b foo
> >
> > This creates the buffer foo, but erroneously splits the displayed window 
> > and displays the new buffer in the right hand or bottom half of the 
> > frame (depending on the frame's geometry).
> >
> > The window should not be split, and the new buffer should occupy the 
> > entirety of the original window.
> 
> AFAICS, that's not a bug.  Emacs 25, 26, 27 and 28 behave the same 
> (switch-to-buffer calls pop-to-buffer), and it makes sense to leave, by 
> default, the buffer in which M-x was called visible.  You can customize 
> that behavior with display-buffer-base-action.

Indeed, I don't think this long-time behavior is a bug.  It's more
like a feature.