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def revert(self, filenames, old_tree=None, backups=True,
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1658
from bzrlib.conflicts import resolve
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old_tree = self.basis_tree()
1661
conflicts = transform.revert(self, old_tree, filenames, backups, pb)
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conflicts = transform.revert(self, old_tree, filenames, backups, pb,
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self.set_parent_ids(self.get_parent_ids()[:1])