merge method
Implementation
ZeroNavigationBarStyle merge(ZeroNavigationBarStyle? other) {
if (other == null) return this;
return copyWith(
backgroundColor: other.backgroundColor,
indicatorColor: other.indicatorColor,
unselectedColor: other.unselectedColor,
selectedColor: other.selectedColor,
unselectedIconColor: other.unselectedIconColor,
selectedIconColor: other.selectedIconColor,
height: other.height,
indicatorType: other.indicatorType,
);
}