Variable: ediff-highlight-all-diffs
ediff-highlight-all-diffs is a customizable and buffer-local variable
defined in ediff-init.el.gz.
Documentation
If nil, only the selected differences are highlighted.
Otherwise, all difference regions are highlighted, but the selected region is shown in brighter colors.
Source Code
;; Defined in /usr/src/emacs/lisp/vc/ediff-init.el.gz
(defcustom ediff-highlight-all-diffs t
"If nil, only the selected differences are highlighted.
Otherwise, all difference regions are highlighted, but the selected region is
shown in brighter colors."
:type 'boolean
:group 'ediff-highlighting)