VERSION
"GNU Emacs 26.1 (build 1, x86_64-apple-darwin13.4.0, NS appkit-1265.21
Version 10.9.5 (Build 13F1911)) of 2018-04-10"

DESCRIPTION
Functions added to window-configuration-change-hook are not executed in
26.1rc1. It works in 25.3.1.

TO REPRODUCE
1) emacs -q
2) Eval in *scratch*: (add-hook 'window-configuration-change-hook (lambda
() (ding)))
3) Resize window
4) There is no sound (i.e. ding is not executed) on 26.1rc1. It works as
expected on 25.3.1.