Not clear why this worked before but not now. This fix makes sense regardless.
Without this fix, clicks would not be sent through to the token field menu because its window wasn't the key window.
This fix makes the autocomplete menu declare it does not need to and does not want to become the key window.
Fixes#1807.
Without this fix, `CPPanel` followed the same rules as `CPWindow` with regards to becoming the key window. But `CPPanel` is supposed to always be willing to become the key window, as stated in its documentation.
This change makes `CPPanel` always return `YES` for `canBecomeKeyWindow`.