To answer my own question...
My issue turned to be caused by a bad graft in my repo (unfortunately,
since hardened with filter-branch) that was making the commit that
modified F on Y reachable from X. The graft was an (incorrectly
executed) attempt to deal with the "3+ parent" problem that sometim
I am getting some unexpected results from a merge and I'd like to
understand why.
I have two commits X and Y that I want to merge.
git merge-base X Y # yields B
git diff B X -- F # is empty
git diff B Y -- F # contains the change I want merged
git rev-list X ^B -- F # is empty
git rev-list Y ^B
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