[Merge] lp:~osomon/webbrowser-app/uitk-1.3 into lp:webbrowser-app

[Ugo Riboni]

Review: Approve

The default Popover size seems to have been changed to something that is not large enough to contain the text of the "open this link in another tab" contextual action. 

Other than that LGTM and all tests pass.
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https://code.launchpad.net/~osomon/webbrowser-app/uitk-1.3/+merge/267544
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