I can get the behavior I want by adding the following to my .reviewboardrc:
# .reviewboardrc
_MERGE_BASE_CMD = ["git", "merge-base", "origin/master", "HEAD", ]
_merge_base = subprocess.Popen(_MERGE_BASE_CMD,
stdout=subprocess.PIPE
).communicate()[0].strip().decode('utf-8')
TRACKING_BRANCH = _merge_base
... however it gives me an ugly (and I daresay, incorrect) warning message
before showing the (correct!) diff output:
WARNING: Could not determine specific upstream remote to use for diffs. We
recommend setting TRACKING_BRANCH in reviewboardrc to your nearest upstream
remote branch.
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