NSPopover Close behaviour when entering Mission Control or LaunchPad

Geoff Coope asked about the close: behaviour of the NSPopover when entering Mission Control in the comments  of my previous post   Epiphany-for-fixing-nspopover .

He had noticed that the Popovers did not close when you entered into Mission Control

This was not something I had noticed as I had never gone into Mission Control with a popover open.  But he was right and not only in Mission Control, entering  Launchpad also does not close the Popover.

I had just been using a notification to control a NSDocuments behaviour and had an idea that the same thing could work.

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