added composed schema extension for composed models founds

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/DefaultGenerator.java

@@ -394,8 +394,14 @@ public int compare(String o1, String o2) {
 
          if (composedModels != null && !composedModels.isEmpty()) {
             for (CodegenModel composedModel : composedModels) {
+                if (allProcessedModels.get(composedModel.name) != null) {
+                    final Map<String, Object> models = (Map<String, Object>) allProcessedModels.get(composedModel.name);
+                    models.put("x-is-composed-model", composedModel.isComposedModel);
+                    continue;
+                }
                 final Map<String, Object> models = processModel(composedModel, config, schemas);
                 models.put("classname", config.toModelName(composedModel.name));
+                models.put("x-is-composed-model", composedModel.isComposedModel);
                 models.putAll(config.additionalProperties());
                 allProcessedModels.put(composedModel.name, models);
             }
@@ -1061,8 +1067,6 @@ private Map<String, Object> processModel(CodegenModel codegenModel, CodegenConfi
         objs.put("package", config.modelPackage());
         List<Object> models = new ArrayList<>();
 
-        objs.put("x-is-composed-model", codegenModel.isComposedModel);
-
         Map<String, Object> modelObject = new HashMap<>();
         modelObject.put("model", codegenModel);
         modelObject.put("importPath", config.toModelImport(codegenModel.classname));