GNU bug report logs - #15938
diff-mode mishandles diff-default-read-only

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ivan Shmakov <ivan <at> siamics.net>
To: bug-gnu-emacs <at> gnu.org
Subject: diff-mode mishandles diff-default-read-only 
Date: Wed, 20 Nov 2013 19:47:29 +0000

	In addition to making the -*- Diff -*- buffers read-only when
	diff-default-read-only is non-nil, diff-mode also makes such
	buffers /writable/ when diff-default-read-only is nil, while per
	the documentation, I’d expect for diff-mode to have no effect on
	buffer-read-only in this latter case.

	Please consider the patch below, which seems to fix the issue.

--- diff-mode.el.~1~
+++ diff-mode.el	2013-11-20 19:42:41.000000000 +0000
@@ -1366,7 +1366,8 @@ (define-derived-mode diff-mode fundamental-mode "Diff"
 
   (diff-setup-whitespace)
 
-  (setq buffer-read-only diff-default-read-only)
+  (when 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)

-- 
FSF associate member #7257

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