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bug#17148: 23.1; Revert Buffer

From: Stefan Monnier
Subject: bug#17148: 23.1; Revert Buffer
Date: Tue, 01 Apr 2014 16:14:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

>> Emacs is not notified, when a file changes its state outside Emacs. Only
>> prior to writing to a file Emacs checks, whether a file has changed on disk.
> Why can't the revert-buffer menu-item check the file mode bits match,
> the same way it verifies the modtime? IMO it should just call
> file-attributes once, and use that to check time and permissions.

Because revert-buffer is meant to handle the file's content, not its
read-only setting.
E.g. maybe the buffer is read-only because the user hit C-x C-q.

Maybe we should use a 3rd setting for buffer-read-only which says "obey
the file's writability".


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