select2 is never marked valid

[Coneko]

http://plnkr.co/edit/foEUd1

It's correctly marked as ng-invalid and ng-invalid-required, but when you choose an option the classes aren't updated. Note that if you inspect the select element which select2 hides, that one's classes are updated correctly.

[ProLoser]

AngularUI is currently undergoing a restructure. This project will no longer hold the codebase, can you please relocate this to https://github.com/angular-ui/ui-select2 (after confirming it's still necessary with the latest code)?

[Coneko]

Ok, I'll check later, thanks.