Thanks to Christian we have a bunch of clean-ups in the way KMail's addressee and recipient editors work. This new code will probably be fast-tracked into the 3.5 branch, but for now we have it only in the features branch for testing. So, please do test.
Feedback to [email protected] please. Not all of our new contributors are reading my blog.
In particular, this patch addresses the following bug reports (at least):
Bug 98691: tab completion last name / nickname
 I mean that the KMail core developers already have reviewed the code and seem to like it, and this is really bug fixing and not a set of new features.