docs: private void initRelatedPortlets() {
          final Set<MarketplacePortletDefinition> allRelatedPortlets = new HashSet<>();
  
          for (PortletCategory parentCategory :
                  this.portletCategoryRegistry.getParentCategories(this)) {
  
              final Set<IPortletDefinition> portletsInCategory =
                      this.portletCategoryRegistry.getAllChildPortlets(parentCategory);
  
              for (IPortletDefinition portletDefinition : portletsInCategory) {
                  allRelatedPortlets.add(
                          new MarketplacePortletDefinition(
                                  portletDefinition,
                                  this.marketplaceService,
                                  this.portletCategoryRegistry));
              }
          }
  
          allRelatedPortlets.remove(this);
          this.relatedPortlets = allRelatedPortlets;
      }