[Merge] lp:~phablet-team/messaging-app/send_message_validators into lp:messaging-app/staging

[Tiago Salem Herrmann]

Review: Approve

this approach works fine.
Just tested many use cases and it seems to work for all of them.
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https://code.launchpad.net/~phablet-team/messaging-app/send_message_validators/+merge/311268
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