src/vs/workbench/browser/parts/sidebar/sidebarPart.ts/SidebarPart/getPaneComposites
class SidebarPart:	getPaneComposites(): PaneCompositeDescriptor[] {
		return this.viewletRegistry.getPaneComposites().sort((v1, v2) => {
			if (typeof v1.order !== 'number') {
				return -1;
			}

			if (typeof v2.order !== 'number') {
				return 1;
			}

			return v1.order - v2.order;
		});
	}