copy of schema_part saved in shared expanded schema object and fix checkCircular() for support this

gadget_json_generated_form.js

@@ -35,9 +35,14 @@
 
   function checkCircular(g, path, url) {
     var required_stack,
+      idx,
       prev_field_path = getMaxPathInDict(g.props.schema_required_urls, path);
     required_stack = g.props.schema_required_urls[prev_field_path] || [];
-    if (required_stack.indexOf(url) >= 0) {
+    idx = required_stack.indexOf(url);
+    if (idx >= 0) {
+      if (path === prev_field_path && idx === 0) {
+        return;
+      }
       throw new Error("Circular reference detected");
     }
     g.props.schema_required_urls[path] = [url].concat(required_stack);
@@ -212,7 +217,7 @@
           // otherwise we have issue in convertToRealWorldSchemaPath
           g.props.schema_map[path] = url;
         }
-        schemaPushSchemaPart(g.props.schema, path, schema_part);
+        schemaPushSchemaPart(g.props.schema, path, JSON.parse(JSON.stringify(schema_part)));
         // console.log(g.props.schema[""]);
         return schema_part;
       });