Cannot apply border to InkWell in material defaults

[coder-with-a-bushido]

When trying to give the items in the TypeAheadField a border radius, the inbult InkWell of the material defaults will draw outside of the border radius, as they themselves have no border radius.

[micahmo]

I have this issue as well. It's a minor issue, but it's a visual annoyance since the border of the suggestions dropdown widget is rounded, but the border of the individual items' inkwells is square, so the inkwell goes outside the bounds of the dropdown.