(diff): Add a revert-buffer function.

1 files changed, 3 insertions, 0 deletions

diff --git a/lisp/diff.el b/lisp/diff.el
index c776e36dfdc..dab3c7ebff3 100644
--- a/lisp/diff.el
+++ b/lisp/diff.el
@@ -247,6 +247,9 @@ With prefix arg, prompt for diff switches."
                                   'diff-parse-differences
                                   nil nil nil nil nil nil no-async))
           (set-buffer buf)
+          (set (make-local-variable 'revert-buffer-function)
+               `(lambda (ignore-auto noconfirm)
+                  (diff ',old ',new ',switches ',no-async)))
           (set (make-local-variable 'diff-old-file) old)
           (set (make-local-variable 'diff-new-file) new)
           (set (make-local-variable 'diff-old-temp-file) old-alt)