[Merge] lp:~artmello/gallery-app/gallery-app-fix_1529452 into lp:gallery-app

[Arthur Mello]

Arthur Mello has proposed merging lp:~artmello/gallery-app/gallery-app-fix_1529452 into lp:gallery-app.

Commit message:
Make sure to request a thumbnail big enough to handle all the possible sizes that way media items will not request a new one every time it changes its position.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1529452 in thumbnailer (Ubuntu): "Gallery app asks for same image multiple times at different sizes"
  https://bugs.launchpad.net/ubuntu/+source/thumbnailer/+bug/1529452

For more details, see:
https://code.launchpad.net/~artmello/gallery-app/gallery-app-fix_1529452/+merge/284116

Make sure to request a thumbnail big enough to handle all the possible sizes that way media items will not request a new one every time it changes its position.

Testing on device:
------------------
1. $ thumbnailer-admin clear # make sure thumbnailer cash is cleared
2. $ tail -f ~phablet/.cache/upstart/dbus.log # check log for thumbnailer requests (at least for me only MISS requests are being showed)
3. Launch gallery with some photos at the collection
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~artmello/gallery-app/gallery-app-fix_1529452 into lp:gallery-app.
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