[Merge] lp:~michael-sheldon/webbrowser-app/fix-1531179 into lp:webbrowser-app

[Olivier Tilloy]

Review: Approve

LGTM, thanks for working promptly on this.

One minor suggestion: in Thumbnailer.qml, instead of importing QtQuick and instantiating a visual item, you could import QtQml and instantiate a more lightweight QtObject.
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https://code.launchpad.net/~michael-sheldon/webbrowser-app/fix-1531179/+merge/281650
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