From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: wrong handling of text git attribute leading to files incorrectly reported as modified
Date: Tue, 15 Apr 2014 14:23:35 -0700
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Cc: Frank Ammeter <git@ammeter.ch>,
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To: Brandon McCaig <bamccaig@gmail.com>
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In-Reply-To: <CANUGeEYoS+t57jfpEoZE-2u_cD1uOD5pdp=yF--Rhpb9z91qxQ@mail.gmail.com>
	(Brandon McCaig's message of "Tue, 15 Apr 2014 16:12:50 -0400")
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Brandon McCaig <bamccaig@gmail.com> writes:

> That is for your benefit, and for easily sharing that configuration
> with collaborators. Git only cares that the file exists in your
> working tree at run-time.

It is a lot more than "for sharing".  If you made .gitignore only
effective after it gets committed, you cannot test your updated
version of .gitignore is correct before committing the change.