On Fri, Apr 27, 2018 at 5:24 PM, Elijah Newren [off-list ref] wrote:

I would expect that a different example involving non-linear history
would behave the same, if both sides update the submodule in a fashion
that is just fast-forwarding and one commit contains the other in its
history.  I'm curious if you have a counter example.

My interpretation of the counter example was that the two submodule
updates were not linear (i.e. one did not contain the other after
updating).

I could be wrong, so more clarification from Lief would be helpful in
illuminating the problem.

Thanks,
Jake