Variable: dframe-help-echo-function
dframe-help-echo-function is a buffer-local variable defined in
dframe.el.gz.
Documentation
A function to call when help-echo is used in newer versions of Emacs.
Typically used to display info about the line under the mouse.
Source Code
;; Defined in /usr/src/emacs/lisp/dframe.el.gz
(defvar-local dframe-help-echo-function nil
"A function to call when help-echo is used in newer versions of Emacs.
Typically used to display info about the line under the mouse.")