@TestOnly
  public static void disableSlowCompletionElements(Disposable disposable) {
    boolean previousValue = isSlowCompletionEnabled;
    isSlowCompletionEnabled = false;
    Disposer.register(disposable, () -> isSlowCompletionEnabled = previousValue);
  }
@TestOnly
  public static void disableSlowCompletionElements(Disposable disposable)