bug#55257: 29.0.50; New command `scratch-buffer' inconsistent with startup

[David Ponce <da_vid@orange.fr>]

Hello,

The new command `scratch-buffer' does not re-create the *scratch* buffer
like in startup.el.

The below patch fix this:
--- a/./installs/emacs/lisp/simple.el
+++ b/./emacs.d/simple.el
@@ -10221,7 +10221,8 @@ If the buffer doesn't exist, create it first."
        (pop-to-buffer-same-window "*scratch*")
      (pop-to-buffer-same-window (get-buffer-create "*scratch*"))
      (when initial-scratch-message
-      (insert initial-scratch-message))
+      (insert (substitute-command-keys initial-scratch-message))
+      (set-buffer-modified-p nil))
      (funcall initial-major-mode)))

Thanks!

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, cairo version 1.17.4)
  of 2022-05-04
Repository revision: 268713e227e8b665b1874c96ea96d1e7fccaab11
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Fedora Linux 35 (KDE Plasma)

Configured using:
  'configure --with-cairo --without-sqlite3
  PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/lib/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
WEBP X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
   value of $LC_TIME: fr_FR.utf8
   value of $LANG: fr_FR.UTF-8
   locale-coding-system: utf-8-unix