docs: public void setBusy(String message) {
          busyMessage = message = StrUtil.formatMessage(message);
  
          if (busyDisabled) {
              busyPending = true;
          } else if (message != null) {
              disableActions(true);
              ClientUtil.busy(container, message);
              busyPending = !isVisible();
          } else {
              disableActions(false);
              ClientUtil.busy(container, null);
              busyPending = false;
          }
      }