!include once #1030303 // JNA Win32

static L<HWND> jnaWindows_allWindowHandles() {
  new L<HWND> windows;
  User32.INSTANCE.EnumWindows(new WNDENUMPROC {
    @Override
    public boolean callback(HWND hWnd, Pointer arg1) {
      ret true with windows.add(hWnd);
    }
  }, null);
  ret windows;
}

Began life as a copy of #1030296