rerender work for addSchemaButtons too

gadget_json_generated_form.js

@@ -577,18 +577,44 @@
         if (schema_alternatives.length === 1) {
           return RSVP.Queue()
             .push(function () {
+              if (rerender) {
+                return rerender(undefined, schema_alternatives);
+              }
+              return true;
+            })
+            .push(function (ret) {
               var input = document.createElement("button");
               input.setAttribute("class",
                 "ui-shadow-inset ui-btn ui-btn-inline ui-corner-all" +
                 " ui-btn-icon-notext ui-icon-btn ui-icon-plus ui-input-btn");
               input.type = "button";
+              input.hidden = !ret;
               gadget.props.add_buttons.push({
                 element: input,
                 event: function () {
                   return event(schema_alternatives[0].value)
                     .push(function () {
+                      if (rerender) {
+                        return rerender(undefined, schema_alternatives);
+                      }
+                      return true;
+                    })
+                    .push(function (r) {
+                      input.hidden = !r;
                       return checkValidityAndNotifyChange(gadget);
                     });
+                },
+                rerender: function () {
+                  return RSVP.Queue()
+                    .push(function () {
+                      if (rerender) {
+                        return rerender(undefined, schema_alternatives);
+                      }
+                      return true;
+                    })
+                    .push(function (r) {
+                      input.hidden = !r;
+                    });
                 }
               });
               return input;
@@ -978,14 +1004,17 @@
                   item_list.push([item.title, x]);
                 }
               }
+              if (gadget_s) {
                 return {
                   name: gadget_s.element.getAttribute('data-gadget-scope'),
                   editable: true,
-                hidden: item_list.length === 0,
+                  hidden: item_list.length === 1,
                   value: item_list[0][1],
                   item_list: item_list
                 };
               }
+              return item_list.length > 1;
+            }
           });
       })
       .push(function (element) {
@@ -1235,6 +1264,8 @@
     .allowPublicAcquisition("deleteChildren", function (arr, scope) {
       var g = this,
         key,
+        i,
+        button_list = this.props.add_buttons,
         objects = this.props.objects,
         element = getSubGadgetElement(g, scope),
         parent = element.getAttribute("data-json-parent"),
@@ -1253,6 +1284,9 @@
           tasks.push(g.props.add_custom_data[key].rerender());
         }
       }
+      for (i = 0; i < button_list.length; i = i + 1) {
+        tasks.push(button_list[i].rerender());
+      }
       tasks.push(checkValidityAndNotifyChange(g));
       return RSVP.Queue()
         .push(function () {