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

[Tiago Salem Herrmann]

Review: Approve

Just verified that all bugs found by bill are fixed.
Tested on arale.
Could not find any other regression.
Looks good to me.
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https://code.launchpad.net/~fboucault/messaging-app/async_bottom_edge/+merge/297334
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