Comment 18 for bug 1605513

Worth mentioning Flickable's mouse wheel support is also pretty poor. If you move the wheel too quickly the Flickable may ignore the movement completely. If you move the wheel slowly that can make the scrolling go much faster.

Mouse wheels are relevant because it's the same code path as touchpad scrolling. High precision touchpad scrolling just emits smaller fractional values (float/QReal) of what would be a mouse wheel increment. And it works great everywhere except for Qt Flickable, which Unity8 uses a lot. :)