[Merge] lp:~osomon/webbrowser-app/qt53-workaround-QTBUG-39255 into lp:webbrowser-app

[Timo Jyrinki]

Review: Approve

Looking good now after the latest commit, all tests pass also on armhf in addition to x86:
https://launchpad.net/~ci-train-ppa-service/+archive/landing-005/+build/6068295

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https://code.launchpad.net/~osomon/webbrowser-app/qt53-workaround-QTBUG-39255/+merge/220985
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