input[type="date"] validity doesn't change when min/max change

[scottopherson]

While creating the jsfiddle example in my previous issue, I noticed that the validity of the date input doesn't get updated when the values of min/max change.

http://jsfiddle.net/va4kb/2/

Might just need a fix similar to: #6369

Edit:
Though, the validity of the date input does get updated if you make a change to the input after min/max are changed.

[matsko]

I've made some progress on this and my local code works for string-based date values (the first example in your demo). But the pure date object min/max value stuff doesn't work yet. I will resume the bug fix next week once I get someone to help me understand $interpolate (since that needs to be patched first).