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bzrlib/versionedfile.py

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        """

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        raise NotImplementedError(self.add_fallback_versioned_files)

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    def get_known_graph_ancestry(self, keys):

 

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        """Get a KnownGraph instance with the ancestry of keys."""

 

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        parent_map, missing_keys = self._index.find_ancestry(keys)

 

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        for fallback in self._transitive_fallbacks():

 

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            if not missing_keys:

 

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                break

 

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            (f_parent_map, f_missing_keys) = fallback._index.find_ancestry(

 

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                                                missing_keys)

 

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            parent_map.update(f_parent_map)

 

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            missing_keys = f_missing_keys

 

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        kg = _mod_graph.KnownGraph(parent_map)

 

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        return kg

 

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class _PlanMergeVersionedFile(VersionedFiles):

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    """A VersionedFile for uncommitted and committed texts.

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