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

[Florian Boucault]

Review: Needs Fixing

'overview' cannot be referred to as it is not defined in this file. Instead viewer.width and viewer.height should probably be used.
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-avoid_reload_fullscreen_toggle/+merge/269424
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