Variable: focus-out-hook
focus-out-hook is a variable defined in frame.el.gz.
This variable is obsolete since 27.1; after-focus-change-function
Value
nil
Documentation
Normal hook run when all frames lost input focus.
This hook is obsolete; see focus-in-hook. Depending on timing,
this hook may be delivered when a frame does in fact have focus.
Prefer after-focus-change-function.
Probably introduced at or before Emacs version 24.4.
Source Code
;; Defined in /usr/src/emacs/lisp/frame.el.gz
(defvar focus-out-hook nil
"Normal hook run when all frames lost input focus.
This hook is obsolete; see `focus-in-hook'. Depending on timing,
this hook may be delivered when a frame does in fact have focus.
Prefer `after-focus-change-function'.")