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evolve: fix content-div resolution when in parent-child form

case:
"two divergent csets where one is the parent of other"

  cset_b (content-divergent)
  |
  cset_a (content-divergent)
  |
  ~

Before this patch, we were not correctly handling the case when both the
divergent cset are in parent-child form. And its resolution was going
through the logic which solves other variants of content-divergence.

Resolution (after this patch):
merge is performed between the two and parent (or parent's successor,
if apply) of lower one is treated as resolution parent.

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