Comment 46 for bug 49579

I'm not clear that there is definitely a need for a keyboard grab to implement menus with access keys, even though that is what toolkits often do.

It may be convenient from the perspective that events are directed to the menu window.

But in most cases the main application window would have focus and so the application can receive keyboard events there.

If for some reason a client does not normally receive focus in the main window, I wonder whether it should negotiate keyboard focus (perhaps under the Globally Active Input model) rather than stealing a keyboard grab, which cannot be overridden until the client releases.