From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: git-diff on touched files: bug or feature?
Date: Wed, 01 Aug 2007 12:07:04 -0700
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Cc: Matthieu Moy <Matthieu.Moy@imag.fr>, git@vger.kernel.org
To: Alexandre Julliard <julliard@winehq.org>
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Alexandre Julliard <julliard@winehq.org> writes:

> .... For
> instance in vc-git.el the workfile-unchanged-p function currently has
> to rehash the file every time to see if it really changed, because we
> can't afford to refresh the whole project at that point.

Maybe I am missing something.  Why can't you "afford to"?

"update-index --refresh" looks at only the files whose cached
stat information does indicate there might be chanegs.  It does
not rehash already up-to-date ones.