src/vs/workbench/browser/actions/navigationActions.ts/NavigateDownAction/constructor
class NavigateDownAction:	constructor(
		id: string,
		label: string,
		@IEditorGroupsService editorGroupService: IEditorGroupsService,
		@IPanelService panelService: IPanelService,
		@IWorkbenchLayoutService layoutService: IWorkbenchLayoutService,
		@IViewletService viewletService: IViewletService
	) {
		super(id, label, Direction.Down, editorGroupService, panelService, layoutService, viewletService);
	}