src/vs/platform/actions/browser/menuEntryActionViewItem.ts/SubmenuEntryActionViewItem/constructor
class SubmenuEntryActionViewItem:	constructor(
		action: SubmenuItemAction,
		@IContextMenuService contextMenuService: IContextMenuService
	) {
		super(action, { getActions: () => action.actions }, contextMenuService, {
			menuAsChild: true,
			classNames: ThemeIcon.isThemeIcon(action.item.icon) ? ThemeIcon.asClassName(action.item.icon) : undefined,
		});
	}