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

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

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