rangeValueIndicatorShape property Null safety
The shape that will be used for the RangeSlider's value indicators.
The default shape uses the same value indicator for each thumb, but strokes the top value indicator when it overlaps the bottom value indicator. The top indicator corresponds to the top thumb, which is always the most recently selected thumb.
The default value is PaddleRangeSliderValueIndicatorShape.
final RangeSliderValueIndicatorShape? rangeValueIndicatorShape;