Variable: diff-default-read-only
diff-default-read-only is a customizable variable defined in
diff-mode.el.gz.
Value
nil
Documentation
If non-nil, diff-mode buffers default to being read-only.
Source Code
;; Defined in /usr/src/emacs/lisp/vc/diff-mode.el.gz
(defcustom diff-default-read-only nil
"If non-nil, `diff-mode' buffers default to being read-only."
:type 'boolean)