1463
1463
target_ids = set(self.target.all_revision_ids())
1464
1464
if revision_id is not None:
1465
1465
source_ids = self.source.get_ancestry(revision_id)
1468
1469
source_ids = self.source.all_revision_ids()
1469
1470
result_set = set(source_ids).difference(target_ids)