[Merge] lp:~fboucault/webbrowser-app/background_open_tabs_adjacent into lp:webbrowser-app/staging

[Olivier Tilloy]

> Maybe not something we want to address in this branch, but it would be
> a nice improvement to build on top of this branch.

Actually, I think it would make sense to implement this in this branch. I guess we need to add a property to BrowserTab so that it remembers its "parent" tab, and restores focus on it when closed.
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https://code.launchpad.net/~fboucault/webbrowser-app/background_open_tabs_adjacent/+merge/316226
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