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2019-01-24combine-diff: treat --summary like --statLibravatar Jeff King1-0/+6
Currently "--cc --summary" on a merge shows nothing. Since we show "--cc --stat" as a stat against the first parent, and because --summary is typically used in combination with --stat, it makes sense to treat them both the same way. Note that we have to tweak t4013's setup a bit to test this case, as the existing merges do not have any --summary results against their first parent. But since the merge at the tip of 'master' does add and remove files with respect to the second parent, we can just make a reversed doppelganger merge where the parents are swapped. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>