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-rw-r--r--lisp/vc/diff-mode.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index e945d6ef160..0bf0b05c7d5 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -1366,7 +1366,8 @@ a diff with \\[diff-reverse-direction].
(diff-setup-whitespace)
- (setq buffer-read-only diff-default-read-only)
+ (if diff-default-read-only
+ (setq buffer-read-only t))
;; setup change hooks
(if (not diff-update-on-the-fly)
(add-hook 'write-contents-functions 'diff-write-contents-hooks nil t)