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

[Bill Filler]

Review: Needs Fixing

It's registered properly but it has issues:

1) Launch app, go to events page
- call url-dispatcher photo://file1.jpg
- the photo is opened correctly
- tap the photo to display the header
- press the back button in the header to go back to Events view
- call url-dispatcher photo://file1.jpg again
- the photo is never shown
Photos are never shown if they were previously requested by url-dispatcher.

2)  Launch app, go to events page
- call url-dispatcher photo://file1.jpg
- the photo is opened correctly
- call url-dispatcher photo://file2.jpg
- the photo is opened correctly
- tap on the photo to display header
- press the back button
- You get a blank page, still showing the Gallery header with the back button
- press the back button again and it correctly shows the Events view

Seems like each time you open a photo via the url-dispatcher you are putting a new page on the stack and you have to pop all of them by pressing the back button each time to get back to the event view. This is not correct. If you repeat the same thing above 5 times you have to press back button 5 times to get back to Events view.

3) Similar problem
- open a photo from Events view or Photo view
- call url-dispatcher photo://file1.jpg
- tap photo to reveal header
- press back button
- get a blank page with Gallery header
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-support_photo_url/+merge/235656
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