src/vs/workbench/browser/panecomposite.ts/PaneCompositeDescriptor/constructor
class PaneCompositeDescriptor:	private constructor(
		ctor: IConstructorSignature<PaneComposite>,
		id: string,
		name: string,
		cssClass?: string,
		order?: number,
		requestedIndex?: number,
		readonly iconUrl?: URI
	) {
		super(ctor, id, name, cssClass, order, requestedIndex);
	}