"Ultra-flat-icons" collection used for icons Tooltip is too large when an icon uses vector data. I am working on Kubuntu 17.04 with KDE backports and with 5.9 version it was OK but now the tooltip is horrible.
Created attachment 105976 [details] screenshot-1
Created attachment 105977 [details] screenshot-2
Created attachment 105978 [details] screenshot-3
Created attachment 105979 [details] screenshot-4
The problem can be seen on 3 of screenshots, "screenshot-1" is showing that with the icon provided by the app itself the tooltip is fine.
*** This bug has been marked as a duplicate of bug 380432 ***