"Johannes Schindelin via GitGitGadget" [off-list ref]
writes:
One of my quite common workflows is to see whether an ancient topic branch I
have lying about has made it into Git. Since my local commit OIDs have
nothing to do with the OIDs of the corresponding commits in git/git, my only
way is to fire up git range-diff ...upstream/master, but of course that
output contains way more commits than I care about.
To help this use case, here is a patch series that teaches git range-diff
the --left-only and --right-only options in the end, restricting the output
to those commits and commit pairs that correspond to the commits in the
first and the second range, respectively.
Makes sense.