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http://plnkr.co/edit/Nn20g78t1NXrMCFI9ABL?p=preview
https://github.com/angular/material2/blob/master/src/lib/autocomplete/autocomplete-trigger.ts#L147 / https://github.com/angular/material2/blob/master/src/lib/autocomplete/autocomplete-trigger.ts#L137 this is likely the reason
@kara