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

[Olivier Tilloy]

Review: Needs Fixing

Functional issues:

 - When I expand the bookmarks section, the top sites section fades away as expected, but the bookmarks section can be entirely scrolled out of view, and when I do that I briefly see the section header for top sites appear and disappear

 - Can we add some bottom spacing at the end of the top sites section, so that the bottom edge hint doesn’t overlap the last item in the list?

Visual issues:

 - The "See More" / "See Less" button looks ugly, being white on light grey. I cannot find up-to-date designs for this, but can you at the very least make it the same color as the listview background?
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-format_top_sites/+merge/255298
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