view CONTRIBUTING @ 52136:e68fe567a780 stable

evolution: stop wrongly flagging unrelated part of a split as divergent

Before this change, divergence introduced by successors of a split would "spill"
to other unrelated successors of the split that were not ambiguous.

This small changes fixes it.

Thanks goes to Manuel Jacobs for the discussion leading to this realization that
a new simple and correct definition could be found.

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https://www.mercurial-scm.org/wiki/ContributingChanges

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273ce12ad8f1` will report some style violations on a very old commit).