static JLabel showSuggestion_current;

// runs action in new thread
svoid showSuggestion(fS suggestionText, fO action) {
  final int fontSize = 20, buttonFontSize = 15;
  final JLabel label = fontSize(fontSize, jCenteredMultiLineLabel(suggestionText));
  swing {
    showPackedFrameInBottomRightCorner(showSuggestion_current = 
      withLineBorder(Color.black, withMargin(
        centerAndSouth(
          label,
          withTopMargin(makeFirstButtonBold(fontSizeAll(buttonFontSize, jcenteredbuttons(
            "OK", r {
              hideSuggestion(label);
              callFInNewThread(action);
            }, "No", r { hideSuggestion(label) }))))))));
  }
}