Variable: compare-windows-highlight
compare-windows-highlight is a customizable variable defined in
compare-w.el.gz.
Value
t
Documentation
Non-nil means compare-windows highlights the differences.
The value t removes highlighting immediately after invoking a command
other than compare-windows.
The value persistent leaves all highlighted differences. You can clear
out all highlighting later with the command compare-windows-dehighlight.
This variable was added, or its default value changed, in Emacs 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/vc/compare-w.el.gz
(defcustom compare-windows-highlight t
"Non-nil means `compare-windows' highlights the differences.
The value t removes highlighting immediately after invoking a command
other than `compare-windows'.
The value `persistent' leaves all highlighted differences. You can clear
out all highlighting later with the command `compare-windows-dehighlight'."
:type '(choice (const :tag "No highlighting" nil)
(const :tag "Persistent highlighting" persistent)
(other :tag "Highlight until next command" t))
:version "22.1")