mousevents keep being fired within a webengine app

We had that former issue in our App, but i got back to the nanobrowser sample for simplicity.

Just open the nanobrowser webengine sample and open the attached file with it.

As soon as the window is focused, and wether the mouse moves or not, the window keeps getting an insane amount of mousemove events.
We would expect mousemove events to be fired only when the mouse is being moved, but they just get fired all the time.

Anyways, should be trivial to repro with the attached sample.