sclass DesktopPaneWithFitPicture extends JDesktopPane {
  BufferedImage image;
  *(BufferedImage *image) {}
  
  protected void paintComponent(Graphics g) {  
    paintFitBackground(this, g, image);
  }
}

static JDesktopPane jDesktopPaneWithFitPicture(S imageID) {
  ret swingNu(DesktopPaneWithFitPicture, loadImage2(imageID));
}

Began life as a copy of #1015863