Function IsSection

libraries/lib-menus/MenuRegistry.h:197–201

   template<typename RegistryTraits>
   static inline bool IsSection(const GroupItem<RegistryTraits> &item) {
      auto pProperties = dynamic_cast<const ItemProperties *>(&item);
      return pProperties && pProperties->GetProperties() ==
         ItemProperties::Section;
   }

   struct MenuItemData {
      MenuItemData(TranslatableString title) : mTitle{ std::move(title) } {}