Merge remote-tracking branch 'origin/feature/which-key-in-core'

diff --cc etc/NEWS
index b2fdbc4a88ff2a63a1a618eccd3b6b52303c884c,4916c18e53ab47804f612ce1f3c1489650fcfc33..3b18972860fb3d62f656a77afd3fefcfb1d3441a
--- 1/etc/NEWS
--- 2/etc/NEWS
+++ b/etc/NEWS
@@@ -2056,13 -1982,11 +2056,20 @@@ To revert to the previous behavior, se
  'async-shell-command-mode' to 'shell-mode'.  Any hooks or mode-specific
  variables used should be adapted appropriately.
  
 ++++
 +** New package Window-Tool-Bar.
 +This provides a new minor mode, 'window-tool-bar-mode'.  When this minor
 +mode is enabled, a tool bar is displayed at the top of a window.  To
 +conserve space, no tool bar is shown if 'tool-bar-map' is nil.  The
 +global minor mode 'global-window-tool-bar-mode' enables this minor mode
 +in all buffers.
++
+++++
+ ** New package Which-Key
+ The 'which-key' package from GNU ELPA is now included in Emacs.  It
+ implements the 'which-key-mode' that displays a table of key bindings
+ upon entering a partial key chord and waiting for a moment.
+ 
  \f
  * Incompatible Lisp Changes in Emacs 30.1