[Merge] lp:~jamesh/gallery-app/thumbnail-mtime into lp:gallery-app

[Arthur Mello]

Review: Needs Fixing

Thanks a lot for looking on that. I found one functional issue when testing it on krillin (r99):

1. Open one photo from "Events" tab;
2. Start editing it and crop the image;
3. Return to the opened photo and confirm it was cropped;
4. Return to the "Events" tab.

Expected result:
The thumbnail is updated with the new cropped image.

Current result:
The thumbnail is not updated.

See that I am not moving the event list and so the thumbnail keeps in the visible area all the time. If I move the event list in a way that the thumbnail leaves the visible area it is correctly refreshed when I return to it. 
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https://code.launchpad.net/~jamesh/gallery-app/thumbnail-mtime/+merge/268185
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