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From: "Alfred M. Szmidt" <ams@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: tabs, git diff and git apply
Date: Sun, 29 Nov 2020 04:13:14 -0500
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    > If you do that again, do you get the same type of diff?

   I get the same result.

    > Does `git
    > diff` have a configuration that is doing context diffs?

   Sure.  You just have to be able to understand the doc.

That is easy to verify, and you should be able to do

   HOME=/tmp git diff

and see if the behaviour still is the same (if it doesn't work, just
running as a different user should).  If it isn't, it is a
configuraiton setting that you have done -- reading the git-config man
page would be the next action to see where such a setting is set.