add reference to notification options and fake `render` action

jsonform.gadget.js

@@ -272,7 +272,7 @@
     hash = url.hash;
     url = url.href;
     if (download_url.startsWith("urn:jio:")) {
-      external_reference = true;
+      external_reference = download_url;
       queue = RSVP.Queue()
         .push(function () {
           return g.resolveExternalReference(download_url, schema_path, path);

jsonform/gadget_json_generated_form_child.js

@@ -348,6 +348,15 @@
           ignore_incorrect: g.props.ignore_incorrect,
           scope: scope
         })
+          .push(function () {
+            if (options.schema_arr.external_reference) {
+              return form_gadget.rootNotifyChange({
+                scope: scope,
+                action: "render",
+                path: "/"
+              });
+            }
+          })
           .push(function () {
             if (form_gadget.props.changed) {
               g.props.changed = true;
@@ -535,6 +544,7 @@
         return schema_arr;
       }
       ret_arr[0].circular = circular;
+      ret_arr.external_reference = schema_arr.external_reference;
       return ret_arr;
     }
     return schema_arr;
@@ -1818,6 +1828,7 @@
             scope: v.scope || g.element.getAttribute("data-gadget-scope"),
             rel_path: v.path,
             path: p,
+            ref: g.props.schema_arr.external_reference,
             action: v.action
           });
         });