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Merge from mbp.

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            return None
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        if parent == NULL_ID or parent is None:
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            if to_name != '.':
 
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            if to_name != u'.':
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                raise SourceRootHasName(self, to_name)
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            else:
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                return '.'
 
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                return u'.'
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        parent_entry = changeset.entries.get(parent)
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        if parent_entry is None:
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            dir = os.path.dirname(id_map[self.id])
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            return None
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        directory = self.get_dir(id)
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        if directory == '.':
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            directory = './.'
 
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            directory = u'./.'
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        if directory is None:
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            return NULL_ID
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        return self.get_rinventory().get(directory)