text: 
  /* CENTER */
  
  setKeyHandler ( 'x', HYPER, () => {
  
    const window = Window.focused ();
  
    if ( !window ) return;
  
    center_window ( window );
  
  });
  
  setKeyHandler ( 'x', HYPER_SHIFT, () => {
  
    const window = Window.focused ();
  
    if ( !window ) return;
  
    const frame = window.frame ();
  
    window.setFrame ({
      x: frame.x,
      y: frame.y,
      width: CENTER_WIDTH,
      height: CENTER_HEIGHT
    });
  
    center_window ( window );
  
  });
  