Pierre-Yves David <pierre-yves.david@octobus.net> [Thu, 19 May 2022 00:51:36 +0100] rev 49223
debugdeltachain: detect a special case where parents are "skipped"
See inline comment for details, this is a case where the delta is neither
against p1 or p2, Yet it is still a simple delta part of a simple chain.
We now display them as `skip1/skip2` instead of `other`.