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

[Arthur Mello]

Yes, there is an issue removing fullscreen mode on devices. The photo viewer does not work properly (header is not removed, for example). I am checking what Olivier Tilloy mentioned about calling fullscreen after the first show. 
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-fix_toolbar_device/+merge/224013
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