[Feature Request] Date picker shows years which are not valid

[mueller-jens]

Problem to solve

if I use allowed-dates, in the year selection all years are visible/selectable, even if the selection of dates is not valid

https://play.vuetifyjs.com/#eNpVjsEKwjAMhl8l9KTg3H10BcG3sB5KG2FYs9K13UF8d2u04C4h+fIn/395iiXa/hTCsWQUg5AJH8GbhEoTgCydCYFbHuxMyUyE8YcYuqruwmTvGBsFGIz384qOt8uoRTE+I4wKuFFAuMK57nZ7LdqZkv3mXTOudOv8Id9gsv8LnMnhrYqcJvE6UPaey/UN+qVKwg==

Proposed solution

Only years should be shown/active if at least one date is selectable