Expand spectrum of window change functions

* src/window.c (run_window_change_functions): Run window
change functions for Qwindow_state_change_functions.
(resize_frame_windows): Set frame's window_change slot when
single-window frames change size.
(Qwindow_state_change_functions): New symbol.
(Vwindow_state_change_functions): New Lisp variable.
* doc/lispref/windows.texi (Selecting Windows): Mention
'window-selection/state-change-functions' and add reference to
Window Hooks.
(Window Hooks): Document 'window-state-change-functions'.
* etc/NEWS: Mention new hook 'window-state-change-functions'.

1 files changed, 6 insertions, 3 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 02503073c1c..10bcc5a2ecc 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1303,14 +1303,17 @@ of the Emacs Lisp Reference manual for more detail.
 
 +++
 ** Window change functions have been redesigned completely.
+
 Hooks reacting to window changes run now only when redisplay detects
-that a change has actually occurred.  The four hooks provided are:
+that a change has actually occurred.  The five hooks provided are:
 'window-buffer-change-functions' (run after window buffers have
 changed), 'window-size-change-functions' (run after a window was
 assigned a new buffer or size), 'window-configuration-change-hook'
-(like the former but run also when a window was deleted) and
+(like the former but run also when a window was deleted),
 'window-selection-change-functions' (run when the selected window
-changed).  'window-scroll-functions' are unaffected by these changes.
+changed) and 'window-state-change-functions' (run when any of the
+preceding ones is run).  'window-scroll-functions' are unaffected by
+these changes.
 
 In addition, a number of functions now allow the caller to detect what
 has changed since last redisplay: 'window-old-buffer' returns for any