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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs 29.0.91: With enable-recursive-minibuffers, C-x b foo splits
 the window.
Date: Wed, 14 Jun 2023 10:35:07 +0000

In emacs-29.0.91:

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.

-- 
Alan Mackenzie (Nuremberg, Germany).

Message #8 received at 64062 <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: 64062 <at> debbugs.gnu.org
Subject: Re: bug#64062: Emacs 29.0.91: With enable-recursive-minibuffers, C-x
 b foo splits the window.
Date: Wed, 14 Jun 2023 10:42:18 +0000

On Wed, Jun 14, 2023 at 10:35:07 +0000, Alan Mackenzie wrote:
> In emacs-29.0.91:

> emacs -Q
> M-: (setq enable-recursive-minibuffers t)
> M-x
> C-x b foo

Apologies: that last line should have read:

  C-x b foo RET.

> 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.

> -- 
> Alan Mackenzie (Nuremberg, Germany).

Message #11 received at 64062 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 64062 <at> debbugs.gnu.org
Subject: Re: bug#64062: Emacs 29.0.91: With enable-recursive-minibuffers,
 C-x b foo splits the window.
Date: Wed, 14 Jun 2023 10:58:39 +0000

>
> 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.

Message #14 received at 64062 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: acm <at> muc.de, 64062 <at> debbugs.gnu.org
Subject: Re: bug#64062: Emacs 29.0.91: With enable-recursive-minibuffers,
 C-x b foo splits the window.
Date: Wed, 14 Jun 2023 14:46:29 +0300

> Cc: 64062 <at> debbugs.gnu.org
> Date: Wed, 14 Jun 2023 10:58:39 +0000
> From: Gregory Heytings <gregory <at> 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.

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