Datepicker popup does not close when you leave popup calendar with tab

[JLuitjens]

Not sure if bug, or intentional behavior. Datepicker popup does not close when you leave the calendar with tab

See images below

http://i.imgur.com/ftrQ7Ej.gif http://i.imgur.com/8FagVmQ.png

No plunkr, because you can reproduce it on the datepicker popup portion on main site

https://angular-ui.github.io/bootstrap/

[ganholete]

Same problem