[Merge] lp:~artmello/webbrowser-app/webbrowser-app-bookmarks_top_sites into lp:webbrowser-app

[Arthur Mello]

> As pointed out in a previous review round: the "see more/see less" action
> should probably trigger a smooth transition.

Fixed on revision 567
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-bookmarks_top_sites/+merge/224592
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