[Merge] lp:~fboucault/messaging-app/async_bottom_edge into lp:messaging-app

[Florian Boucault]

Review: Needs Fixing

>From tiago's testing: "it breaks the use case where we can start messaging-app directly in the new message view via url dispatcher"
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https://code.launchpad.net/~fboucault/messaging-app/async_bottom_edge/+merge/297334
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