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def _copy_one_weave(self, rev_id, file_id, text_revision):
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"""Copy one file weave, esuring the result contains text_revision."""
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to_weave = self.to_weaves.get_weave_or_empty(file_id,
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self.to_storage.get_transaction())
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if text_revision in to_weave:
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from_weave = self.from_weaves.get_weave(file_id,