Variable: server-switch-hook
server-switch-hook is a customizable variable defined in server.el.gz.
Value
(magit-commit-diff)
Documentation
Hook run when switching to a buffer for the Emacs server.
Source Code
;; Defined in /usr/src/emacs/lisp/server.el.gz
(defcustom server-switch-hook nil
"Hook run when switching to a buffer for the Emacs server."
:type 'hook)