Pass Keystrokes received by Overview window back to parent Alignment View

JAL-360 JAL-797 JAL-566 relate to loss of input focus after certain operations, normally the input focus can be restored by closing and opening the overview window (and perhaps closing it again). On W10 this seems to be an issue still, and needs a belt'n'braces fix - suggest trying to route keystrokes from Overview to parent alignment to avoid these problems.