Disable date segments and initialize it if they have only one possible value

[logaretm]

What

When providing a min/max to the date fields, there is little point in letting the user interact with all the segments if some segments have locked ranges.

A locked range can happen in these scenarios:

• Min/Max have the same year, then year segment should be locked.
• Min/Max have the same month and year, then both segments should be locked.

A general rule could be derived that a segment should be locked if all the min/max more significant date parts have equal value.

This is observable in the native HTML date fields, the very first example of the MDN demonstrates this

Furthermore, locked segments can be safely initialized to that locked value, which is required since the user won't be able to edit them.