(diff-buffer-with-file): Call diff synchronously, so we don't delete

the temporary file before diff has a chance to read it.

diff --git a/lisp/files.el b/lisp/files.el
index ac25232bafee4ddf61862fbc58b869548f0d6f24..ac61bbbd017d37353c9dbd86cc3b4b1b14413bc4 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3008,7 +3008,7 @@ This requires the external program \"diff\" to be in your `exec-path'."
              (save-restriction
                (widen)
                (write-region (point-min) (point-max) tempfile nil 'nomessage)))
-           (diff buf-filename tempfile))
+           (diff buf-filename tempfile nil t))
        (when (file-exists-p tempfile)
          (delete-file tempfile)))
       nil)))