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Merge bzr.dev into cleanup resolving conflicts

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from bzrlib import (
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    errors,
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    osutils,
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    revision,
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    symbol_versioning,
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    tree,
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    )
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        return set(self._repository.get_ancestry(self._revision_id,
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                                                 topo_sorted=False))
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    def is_locked(self):
 
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        return self._repository.is_locked()
 
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    def lock_read(self):
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        self._repository.lock_read()
 
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        return self
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    def __repr__(self):
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        return '<%s instance at %x, rev_id=%r>' % (