Call 'window-size-change-functions' for mini-windows

* src/window.c (grow_mini_window, shrink_mini_window): Set the
frame's 'window_sizes_changed' flag.
* src/xdisp.c (redisplay_internal): Call the hooks on
'window-size-change-functions' if the call to 'echo_area_display'
sets the frame's 'window_sizes_changed' flag.
(syms_of_xdisp) <window-size-change-functions>:
Update doc string to indicate the mini-window resizes trigger a
call to the hooks, and don't promise that will happen "before
redisplay".  (Bug#19576, Bug#21333)

* doc/lispref/windows.texi (Window Hooks): Update the description
of 'window-size-change-functions'.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/window.c b/src/window.c
index 0ac76d41861..753c4ab8123 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4555,6 +4555,7 @@ grow_mini_window (struct window *w, int delta, bool pixelwise)
           /* Enforce full redisplay of the frame.  */
           /* FIXME: Shouldn't window--resize-root-window-vertically do it?  */
           fset_redisplay (f);
+          FRAME_WINDOW_SIZES_CHANGED (f) = true;
           adjust_frame_glyphs (f);
           unblock_input ();
         }
@@ -4594,6 +4595,7 @@ shrink_mini_window (struct window *w, bool pixelwise)
           /* Enforce full redisplay of the frame.  */
           /* FIXME: Shouldn't window--resize-root-window-vertically do it?  */
           fset_redisplay (f);
+          FRAME_WINDOW_SIZES_CHANGED (f) = true;
           adjust_frame_glyphs (f);
           unblock_input ();
         }