moving contact in roster leads to duplicate contact (via transport)
When I get contact via Twitter transport (twitter.jabbim.com) then it defaults to be in the group Twitter. When I move it another group (via Drag&Drop or editing Groups in right-click menu) I get immediately duplicate contact with the same name as the previous one, but lowercased. So when I had originally THERealDvorak@twitter.jabbim.com, I have now also therealdvorak@twitter.jabbim.com.