[Feature Request] Toggle fullscreen by double clicking the game area

Typical use case - Steam Deck. When I launch Xenia via Steam, it starts emulating gamepad. I am able to go fullscreen by tapping on Window, then Fullscreen. After this, the only way to leave fullscreen would be to connect an external keyboard so I can press F11 or Esc. Would be much more convenient to be able to leave fullscreen mode by double tapping the display.