Created attachment 111085 [details] screenshot start a new plasma session press alt+space bar to open krunner, type "dolphin" and press enter to open it press alt+space bar to open krunner, type "kate" and press enter to open it hover the first entry in your task manager My screenshot shows the result.
This bug is reproducible only when task manager has NO pinned icon.
*** This bug has been marked as a duplicate of bug 385947 ***