Alternative default behavior: Don't open datepicker on tab focus

[MikaelPorttila]

Feature description / Feature Beschreibung
While users navigate through forms using Tab, it’s not optimal if they get stuck in the date picker popup without intending to make a selection.

The suggestion is to instead change the default behavior so the popup opens only on click or when pressing Enter.

Good resource for recommended behavior and states:
https://www.w3.org/WAI/ARIA/apg/patterns/dialog-modal/examples/datepicker-dialog/