Date field cannot be exited using tab

[lordpomeroy]

Issue:
When clicking into a date field the date picker popup is not closed automatically when using the tabulator key. The user has to click into the next field which slows down the input process.

Wanted solution:
The form should be navigable using the keyboard only.

[jabrandes]

The solution could be quite hard to implement, actually. I did some digging in the AntDV source code and it seems that one cannot simply handle keypress events or similar on the DatePicker component, since the corresponding events are processed internally and won't be emitted for external listeners. At least with the Vue way of life. I could imagine that good old addEventListener on the input DOM node might work though.