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lf.show(revno, rev, delta)
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def show_changed_revisions(branch, old_rh, new_rh, to_file=None, log_format='long'):
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def show_changed_revisions(branch, old_rh, new_rh, to_file=None,
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"""Show the change in revision history comparing the old revision history to the new one.
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:param branch: The branch where the revisions exist