merge method
Implementation
ScrollbarThemeData merge(ScrollbarThemeData? other) {
if (other == null) return this;
return copyWith(
thickness: other.thickness,
hoveringThickness: other.hoveringThickness,
showTrackOnHover: other.showTrackOnHover,
isAlwaysShown: other.isAlwaysShown,
interactive: other.interactive,
radius: other.radius,
thumbColor: other.thumbColor,
hoveringThumbColor: other.hoveringThumbColor,
draggingThumbColor: other.draggingThumbColor,
trackColor: other.trackColor,
hoveringTrackColor: other.hoveringTrackColor,
trackBorderColor: other.trackBorderColor,
hoveringTrackBorderColor: other.hoveringTrackBorderColor,
crossAxisMargin: other.crossAxisMargin,
mainAxisMargin: other.mainAxisMargin,
minThumbLength: other.minThumbLength,
);
}