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 sometimes
occurs when git-svn pulls merges back from SVN.


On Wed, Jul 31, 2013 at 8:14 PM, Jon Seymour <> wrote:
> 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 -- F # contains one commit
> git checkout X
> git merge Y
> fails with fixable merge conflicts on other files, but uses X's copy
> of F instead of Y's.
> I was expecting it to use Y's copy of F, since only Y has modified F since B.
> What could cause this?
> BTW: I am using a git-svn repo that does have some 4+ parent merges in it.
> jon.
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