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35a32c5
(Get the code!)
I realized that due to e10s mochitests disabled, we won't test the default actions of wheel events without APZ. I manually ran the test without non-e10s mochitests. Then, I confirmed that it's all green.
On the other hand, there is a known bug in the patch. The multiplier pref for X axis is applied to deltaY if the wheel event should be treated as horizontal scroll. So, WheelEvent.deltaY may see odd delta value with it especially when the multiplier X is negative (meaning scroll direction is reversed) but multiplier Y is positive. With more complicated code, I can fix it, but I don't know if it's enough worthwhile...