Variable: grep--heading-state
grep--heading-state is a buffer-local variable defined in grep.el.gz.
Documentation
Variable to keep track of the grep--heading-filter state.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/grep.el.gz
(defvar-local grep--heading-state nil
"Variable to keep track of the `grep--heading-filter' state.")