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Only skip diffstats when both oids are valid and identical. This check was causing both false-positives (files included in diffstats with no actual changes (0 lines modified) and false-negatives (showing 0 lines modified in stats when files had actually changed). Also replaced same_contents with may_differ to avoid confusion. Signed-off-by: Thomas Guyot-Sionnest <tguyot@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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