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

[Arthur Mello]

Review: Approve

Issue mentioned above does happen on gallery trunk and is probably not related with this MR, bug #1524973 was created to track this issue.
Thanks a lot for looking at this.
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https://code.launchpad.net/~jamesh/gallery-app/thumbnail-mtime/+merge/268185
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