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This should be the merged ancestry of all parents, plus the
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w = self.weave_store.get_weave_or_empty(ANCESTRY_FILEID)
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w.add(self.rev_id, self.parents, lines)
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self.weave_store.put_weave(ANCESTRY_FILEID, w)
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"""Return merged ancestry lines.
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The lines are revision-ids followed by newlines."""
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def _gather_parents(self):