public @NotNull BalloonBuilder createHtmlTextBalloonBuilder(@NotNull @NlsContexts.PopupContent String htmlContent, @Nullable Icon icon, Color fillColor, @Nullable HyperlinkListener listener) {
    return createHtmlTextBalloonBuilder(htmlContent, icon, null, fillColor, listener);
  }
public @NotNull BalloonBuilder createHtmlTextBalloonBuilder(@NotNull @NlsContexts.PopupContent String htmlContent, @Nullable Icon icon, Color fillColor, @Nullable HyperlinkListener listener)