Comment 1 for bug 909708

Committed a test case reproducing this in revision 350.

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       def testInsertWithDuplicateSubject(self):
               events = parse_events("test/data/three_events.js")
               events[0].subjects.append(list(events[0].subjects[0]))
               ids = self.insertEventsAndWait(events)
               self.assertEquals(3, len(set(ids)))
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