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lock _states to prevent size change during iteration
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@ -404,8 +404,9 @@ class StateMachine(object):
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domain_filter = domain_filter.lower()
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return [state.entity_id for state in self._states.values()
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if state.domain == domain_filter]
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with self._lock:
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return [state.entity_id for state in self._states.values()
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if state.domain == domain_filter]
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def all(self):
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"""Create a list of all states."""
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