[Merge] ~nteodosio/software-properties:attach-url into software-properties:ubuntu/master

[Sebastien Bacher]

Review: Needs Information

Thanks Nathan. The issue with the change suggested by Dimitri here (and the reason GTK isn't providing the option to have an activable URL) is that with the change you need to click on the small circle to change the selection (instead of being able to click anywhere on the line include the text description of the options).

I would like to have input of design and/or Oliver on the right tradeoff. Another option would be to slightly change the design to have the URL as a subtitle/other line and not part of the label...
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https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/454886
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