private @NotNull PresentationData getUpdatedPresentation() {
    final var presentation = getPresentation().clone();
    presentation.clear();
    presentation.setBackground(computeBackgroundColor());
    update(presentation);

    if (shouldPostprocess()) {
      postprocess(presentation);
    }

    myUpdatedPresentation = presentation;
    return presentation;
  }
private @NotNull PresentationData getUpdatedPresentation()