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def iter_changes(self, from_tree, include_unchanged=False,
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specific_files=None, pb=None, extra_trees=None,
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require_versioned=True, want_unversioned=False):
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intertree = InterTree.get(from_tree, self)
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return intertree.iter_changes(include_unchanged, specific_files, pb,
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extra_trees, require_versioned, want_unversioned=want_unversioned)