[Merge] lp:~phablet-team/camera-app/refactor-and-fix-editor-tests into lp:camera-app

[Florian Boucault]

Review: Approve

All tests green on krillin RTM
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https://code.launchpad.net/~phablet-team/camera-app/refactor-and-fix-editor-tests/+merge/250931
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