[Merge] ~nteodosio/software-properties:valid-magic-wait-event into software-properties:ubuntu/master

[Sebastien Bacher]

Review: Needs Information

Thanks, that should work but is there any reason we keep pooling for tokens when the option is not selected? Also wouldn't it be simpler to make the status update conditional to the selected widget option rather than using events? 
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https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/438313
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