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bug#17148: 23.1; Revert Buffer

From: Glenn Morris
Subject: bug#17148: 23.1; Revert Buffer
Date: Tue, 01 Apr 2014 11:54:08 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Michael Albinus wrote:

> 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.

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