t4015: avoid git as a pipe input
In t4015 we have a pattern of git diff [<options, related to color>] | grep -v "index" | test_decode_color >actual && to produce output that we want to test against. This pattern was introduced in 86b452e2 (diff.c: add dimming to moved line detection, 2017-06-30) as then the focus on getting the colors right. However the pattern used is not best practice as we do care about the exit code of Git. So let's not have Git as the upstream of a pipe. Piping the output of grep to some function is fine as we assume grep to be un-flawed in our test suite. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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