[Merge] lp:~jamesh/camera-app/pre-cache-video-thumbnails into lp:camera-app

[Florian Boucault]

Functionally, it's great and achieves what the description promises with a very minimal cost. Very nice improvement indeed!
Code wise, only a couple of details:
- it would be nice to unload the Image once the thumbnail has been loaded; although it is a very small save of a 32x32 image
- the Image {}'s id could be more explicit than just 'thumbnail', for example 'preCachingThumbnail' or something
- also a small comment next to the Image explaining its purpose and specifically why a sourceSize of 32x32 suffices to provide all the benefits would be extra useful

Thanks a lot!
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https://code.launchpad.net/~jamesh/camera-app/pre-cache-video-thumbnails/+merge/273515
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~jamesh/camera-app/pre-cache-video-thumbnails into lp:camera-app.