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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: emacs doc changes
Date: Wed, 19 Apr 2006 21:14:11 -0400
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    Is there a reason not to use unified diffs ("diff -u") when available?

When sending patches to me, I want diff -c format, not diff -u.
I find I cannot understand a diff -u patch unless it is very simple.
When I try to read the lines and think about what they do,
I cannot keep track of which lines are old and which are new.