message: Acknowledge the visibility request
diff: @@ -218,6 +218,9 @@ export default class FromWidgetPostMessageApi {
  if (ActiveWidgetStore.widgetHasCapability(widgetId, Capability.AlwaysOnScreen)) {
  ActiveWidgetStore.setWidgetPersistence(widgetId, val);
  }
  +
  + // acknowledge
  + this.sendResponse(event, {});
  } else if (action === 'get_openid') {
  // Handled by caller
  } else {
  