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        The `MouseWheelEvent.getWheelRotation()` method returned rounded native `NSEvent deltaX/Y` events on Mac OS X.
        The latest macOS Sierra 10.12 produces very small `NSEvent deltaX/Y` values so rounding and summing them leads to the huge value returned from the `MouseWheelEvent.getWheelRotation()`.
        The JDK-8166591 fix accumulates `NSEvent deltaX/Y` and the `MouseWheelEvent.getWheelRotation()` method returns non-zero values only when the accumulated value exceeds a threshold and zero value.
        This is compliant with the `MouseWheelEvent.getWheelRotation()` specification:

        <https://docs.oracle.com/javase/8/docs/api/java/awt/event/MouseWheelEvent.html#getWheelRotation-->

        >Returns the number of "clicks" the mouse wheel was rotated, as an integer. A partial rotation may occur if the mouse supports a high-resolution wheel. In this case, the method returns zero until a full "click" has been accumulated.

        For the precise wheel rotation values, use the `MouseWheelEvent.getPreciseWheelRotation()` method instead.

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                Assignee:
                alexsch Alexandr Scherbatiy
                Reporter:
                vdyakov Victor Dyakov
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