From: Colin Walters <walters@gnu.org>
Date: Sat, 7 Sep 2002 21:30:37 +0000 (+0000)
Subject: (diff-buffer-with-file): Call diff synchronously, so we don't delete
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(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 ac25232bafe..ac61bbbd017 100644
--- 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)))