docs: private String getPropertyName(final String windowIdStr, final String fullAttributeName) {
          final String attributeName;
          if (this.nonNamespacedProperties.contains(fullAttributeName)) {
              attributeName = fullAttributeName;
          } else if (fullAttributeName.startsWith(windowIdStr)) {
              attributeName = fullAttributeName.substring(windowIdStr.length());
          } else {
              return null;
          }
  
          final String mappedPropertyName = this.attributeToPropertyMappings.get(attributeName);
          if (mappedPropertyName == null) {
              logger.warn(
                      "Attribute {} found that matches the portlet window ID but it is not listed in the propertyMappings or nonNamespacedProperties and will not be returned to the portlet",
                      attributeName);
              return null;
          }
  
          return mappedPropertyName;
      }