MenuItem is not triggered by the "Enter" key

Originally my question was here: https://stackoverflow.com/questions/49436480/qml-menuitem-trigger-by-enter-and-keyboard-events-forwarding-dont-work

As you can see, MenuItem should be triggered by "Enter" key, which was working in Qt 5.6. But is not working in 5.10.1 with Quick Controls 2.

We dug down a bit more, and colleague has suggested a fix: https://github.com/lirios/browser/pull/81#issuecomment-375603473

Repro example is attached