Causes datepicker form elements to be marked dirty in AngularJS & AngularStrap

[james-bell]

When there's a form element using AngularStrap's bs-datepicker autofill-event causes the element to be marked as dirty, Angular then sees the form as dirty too. Depending on the timing, the date may show as dirty immediately or only after you click on another field or two. Plunker showing this is here:
http://plnkr.co/edit/gYPSOaXARoHiCrkeTAjh?p=preview

Also seen with Angular 1.2.6 and with Angular-Strap 2.1.1. Firefox 32.0.3 & Chrome 37

Just guessing but somehow autofill-event is seeing the instantiation of the bs-datepicker element as an autofill event?