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From: Junio C Hamano <junkio@cox.net>
Subject: Re: Rename detection at git log
Date: Mon, 20 Nov 2006 03:32:07 -0800
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Jakub Narebski <jnareb@gmail.com> writes:

> That said, it should be fairly easy (if not that useful in true projects
> as I understand it, as stated above) to add to copy detection detection of
> pure copies by comparing hashes.

That is already done as a performance measure (notice the double
loop controlled with "contents_too" in diffcore_rename()).