RelationshipCalc callback: not all signals pass handle_list
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@ -1852,7 +1852,7 @@ class RelationshipCalculator(object):
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#signals are disconnected on close of old database, connect to new
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self.__connect_db_signals(db)
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def _datachange_callback(self, handle_list):
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def _datachange_callback(self, handle_list=None):
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"""
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When data in database changes, the map can no longer be used.
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As the map might be in use or might be generated at the moment,
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