I have a repository with branches master and A and lots of merge activity between the two. How can I find the commit in my repository when branch A was created based on master?
My repository basically looks like this:
-- X -- A -- B -- C -- D -- F (master)
\ / \ /
\ / \ /
G -- H -- I -- J (branch A)
I'm looking for revision A, which is not what git merge-base (--all) finds.