See: http://wstaw.org/m/2013/03/05/snapshot122.png Both sides see the extra line, so it is sent together with the message.
Git bisected, regression is caused by the input handling changes.
Git commit 9140828cce75056f8cb17a5cd354babdf34c10bd by David Edmundson. Committed on 06/03/2013 at 03:55. Pushed by davidedmundson into branch 'master'. Stop new lines appearing on sending messages REVIEW: 109308 M +1 -1 lib/chat-widget.cpp http://commits.kde.org/telepathy-text-ui/9140828cce75056f8cb17a5cd354babdf34c10bd