Prevented default in onPointerDown does not trigger onOutsideClick

Repro: https://codesandbox.io/s/p9jl7jq627

Clicking on a `div` with `mouseDown` default preventer triggers `onOutsideClick`, while clicking on a `div` with `pointerDown` default preventer does not.

This is because `mouseDown` will not be fired if the default is prevented in `pointerDown`, see step 6 under 7.1 in [Pointer Events Specification](https://www.w3.org/Submission/pointer-events/#mapping-for-devices-that-support-hover).

Is this something that this library should support? I tried switching `mouseDown` -> `pointerDown` and `mouseUp` -> `pointerUp` and everything seemed to work like it should.

Start with the linked CodeSandbox reproduction and the Pointer Events Specification section cited in the issue, then inspect the component's existing mouseDown and mouseUp event handling. Done means a pointerDown default-preventer triggers onOutsideClick consistently with the mouseDown case, with behavior verified against the reproduction.

Written by the indexing model from the issue text.