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ENH: Update level tracing effect on mouse wheel event

Sam Horvath requested to merge github/fork/vovythevov/LevelTracingUpdateOnMouseWheel into master

Created by: vovythevov

This allows the level tracing effect to be updated when the user scrolls through the slices.

On the implementation: Note that the method processViewNodeEvents is used instead of adding the events with the MouseMoveEvent as the MouseMoveEvent eats the event (abortEvent == True) which prevent the slice from scrolling. If the MouseWheelForwardEvent and MouseWheelBackwardEvent are given their own case (without abortEvent == True) weird interaction happen as the effect preview is seemingly called before the slice has scrolled to the new offset.

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