Use run-with-idle-timer instead of debounce for responsive image scaling.

* lisp/emacs-lisp/timer.el (debounce, debounce-reduce): Revert macro addition.
https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg01133.html

* lisp/image.el (image-increase-size, image-decrease-size):
Use run-with-idle-timer.
(image--change-size): Rename back from image--change-size-function.

* lisp/image-mode.el (image-mode--setup-mode): Remove hooks
window-size-change-functions and window-selection-change-functions (bug#32672)
(image-fit-to-window): Rename from image--window-change-function.
(image--window-state-change): Rename from image--window-change.
Use run-with-idle-timer.

1 files changed, 0 insertions, 5 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 2cbc373eb03..8a72c31bf9b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2849,11 +2849,6 @@ doing computations on a decoded time structure), 'make-decoded-time'
 filled out), and 'encoded-time-set-defaults' (which fills in nil
 elements as if it's midnight January 1st, 1970) have been added.
 
-** New macros 'debounce' and 'debounce-reduce' postpone function call
-until after specified time have elapsed since the last time it was invoked.
-This improves performance of processing events occurring rapidly
-in quick succession.
-
 ** 'define-minor-mode' automatically documents the meaning of ARG.
 
 +++