src/vs/editor/common/viewModel/overviewZoneManager.ts/ColorZone/compare
class ColorZone:	public static compare(a: ColorZone, b: ColorZone): number {
		if (a.colorId === b.colorId) {
			if (a.from === b.from) {
				return a.to - b.to;
			}
			return a.from - b.from;
		}
		return a.colorId - b.colorId;
	}