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Merge bzr.dev.

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bzrlib/graph.py
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        ancestry = self.ancestry
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        return dict((k, ancestry[k]) for k in keys if k in ancestry)
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@deprecated_function(deprecated_in((1, 16, 0)))
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def _StackedParentsProvider(*args, **kwargs):
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    return StackedParentsProvider(*args, **kwargs)
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class StackedParentsProvider(object):
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    """A parents provider which stacks (or unions) multiple providers.