src/vs/workbench/services/views/common/viewContainerModel.ts/ViewContainerModel/getGroupOrderResult
class ViewContainerModel:	private getGroupOrderResult(a: IViewDescriptor, b: IViewDescriptor) {
		if (!a.group || !b.group) {
			return 0;
		}

		if (a.group === b.group) {
			return 0;
		}

		return a.group < b.group ? -1 : 1;
	}