src/vs/workbench/browser/parts/editor/editorActions.ts/EditorLayoutThreeColumnsAction/constructor
class EditorLayoutThreeColumnsAction:	constructor(
		id: string,
		label: string,
		@ICommandService commandService: ICommandService
	) {
		super(id, label, LAYOUT_EDITOR_GROUPS_COMMAND_ID, commandService, { groups: [{}, {}, {}], orientation: GroupOrientation.HORIZONTAL } as EditorGroupLayout);
	}