Port away from QWheelEvent::orientation()
We are supposed to use QWheelEvent::angleDelta() instead. Upon an horizontal/vertical scroll event, its `x()`/`y()` method will return a value different from zero.
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97a14db7
We are supposed to use QWheelEvent::angleDelta() instead. Upon an horizontal/vertical scroll event, its `x()`/`y()` method will return a value different from zero.