Flip Select Icon When Dropdown is Expanded

[Drew-Daniels]

Would be nice if the selectIcon were flipped 180 degrees when the dropdown is expanded. Currently, it does not change it's rotation when the dropdown is opened:

Unexpanded:

Expanded (Current):

Expanded (Desired):

I can likely figure out how to do this with some CSS logic, but think this might be a nice default behavior, or option to be provided to users.