message: Fix the bell sound when Alt+key is pressed.
diff: @@ -162,6 +162,13 @@ LRESULT IslandWindow::MessageHandler(UINT const message, WPARAM const wparam, LP
  return 0; // eat the message
  }
  }
  + case WM_MENUCHAR:
  + {
  + // GH#891: return this LRESULT here to prevent the app from making a
  + // bell when alt+key is pressed. A menu is active and the user presses a
  + // key that does not correspond to any mnemonic or accelerator key,
  + return MAKELRESULT(0, MNC_CLOSE);
  + }
  }
  // TODO: handle messages here...
  