bug#53189: 29.0.50; Avoid window split in project-shell

[Manuel Uberti]

In order to avoid splitting the current window when I open a shell-mode buffer 
with `project-shell' I have this in my init.el:

(setq-default display-buffer-alist '((".+shell*"
                                      (display-buffer-same-window)
                                      (reusable-frames . nil))))

The first time I use `C-x p s` I am getting the behaviour I want. But if I do 
this:

- `C-x p s`
- `C-x b RET`
- `C-x p s`

The current window is split and the shell-mode buffer appears on the
side.

How can I avoid the window splitting?

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.18, cairo 
version 1.16.0)
 of 2022-01-11 built on hathaway
Repository revision: ecea3f2c8322ca43cbde9976fa6e658100cc2b99
Repository branch: master
System Description: Ubuntu 20.04 LTS

Configured using:
 'configure --with-harfbuzz --with-native-compilation --with-pgtk
 --with-xinput2'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS XIM GTK3 ZLIB

Important settings:
  value of $LC_MESSAGES: en_GB.UTF-8
  value of $LC_MONETARY: it_IT.UTF-8
  value of $LC_NUMERIC: it_IT.UTF-8
  value of $LC_TIME: it_IT.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils pp cl-print
cl-extra time-date pulse color jka-compr help-fns radix-tree help-mode
find-func xref misearch multi-isearch shell pcomplete comint ansi-color
ring thingatpt vc-mtn vc-hg vc-git diff-mode easy-mmode vc-bzr vc-src
vc-sccs vc-svn vc-cvs vc-rcs vc cl-loaddefs cl-lib vc-dispatcher project
seq gv subr-x byte-opt bytecomp byte-compile cconv iso-transl tooltip
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/pgtk-win pgtk-win term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite emoji-zwj charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget keymap hashtable-print-readable backquote threads
dbusbind inotify dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit pgtk lcms2 multi-tty
make-network-process native-compile emacs)

Memory information:
((conses 16 83345 8434)
 (symbols 48 8175 1)
 (strings 32 26707 2619)
 (string-bytes 1 871504)
 (vectors 16 16203)
 (vector-slots 8 278464 10156)
 (floats 8 129 54)
 (intervals 56 809 0)
 (buffers 992 14))

--
Manuel Uberti
www.manueluberti.eu