http://bugs.winehq.org/show_bug.cgi?id=12353
--- Comment #4 from Dmitry Timoshkov dmitry@codeweavers.com 2008-04-05 06:40:01 --- (In reply to comment #3)
Would you accept a patch that only skips the taskbar if the owner is present in the taskbar in the first place?
Only if you could confirm that's what Windows does.