code: public void unmark() {
      // check if it's marked before removing the style class
      if (marked) {
        SimpleControl renderer = (SimpleControl) getField().getRenderer();
        Node markNode = renderer.getFieldLabel();
        markNode.getStyleClass().remove(MARKED_STYLE_CLASS);
        markNode.removeEventHandler(MouseEvent.MOUSE_EXITED, unmarker);
        marked = !marked;
      }
    }
docs: Unmarks a setting.
  Is used for the search, which marks and unmarks items depending on the match as a form of
  visual feedback.