[Merge] lp:~fboucault/camera-app/photo_roll_reliable_indexes into lp:camera-app

[Ugo Riboni]

Review: Approve

Fixes all the mentioned bugs and doesn't seem to introduce any regression. The code is also sensible even though I can't fully understand the QT workaround.
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https://code.launchpad.net/~fboucault/camera-app/photo_roll_reliable_indexes/+merge/233052
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