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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: cc-mode adds newlines
Date: Tue, 30 Nov 2004 02:01:50 -0500
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    The current situation, where (after 0 changes) save-buffer
    returns "(No changes need to be saved)" and write-file
    nevertheless writes a different file, is unfortunate and messy.

This suggests that perhaps require-final-newline should be implemented
in a different way when it IS enabled, so as to avoid this anomalous
behavior.