UI: Press and hold on a message to copy to clipboard only works for received, not sent, messages
Previously, ChatSecure text was not selectable at all. This was improved a bit (though granular selection would be better) with Bug 1356's resolution, https://dev.guardianproject.info/issues/1356, which added the ability to press and hold on a message to copy it to the clipboard. But it only works for received, not sent, messages. Obviously it should work for both.