@Override
        public JsonElement serialize(CodeStyleSchemeJsonDescriptor.PropertyListHolder src,
                                     Type typeOfSrc,
                                     JsonSerializationContext context) {
          JsonObject o = new JsonObject();
          for (AbstractCodeStylePropertyMapper mapper : src) {
            JsonObject langProperties = serializeMapper(mapper);
            o.add(
              mapper.getLanguageDomainId(),
              langProperties
            );
          }
          return o;
        }
@Override
        public JsonElement serialize(CodeStyleSchemeJsonDescriptor.PropertyListHolder src,
                                     Type typeOfSrc,
                                     JsonSerializationContext context)