When you do a scroll, we fire fake mouse events and update hover state. We currently try to throttle those events, but do very little throttling in practice.
The patch below makes it so that we only fire a single set of fake mouse events and only update the hover state once during a scroll. This behavior matches Firefox and generally feels like a better user-experience to me. In addition, this patch makes it so that we dynamically modify the throttling rate (instead of hard-coded values) to workaround slow mouse event handlers that make scrolling slow. In my local tests, this was a clear win and the new code is only marginally more complicated than the old code. https://bugs.webkit.org/show_bug.cgi?id=99940
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