The shadow of panel elements remains drawn after they got hidden, if vsync is off. Reproducible: Always Steps to Reproduce: 1. Disable vsync 2. Open anything from the panel that has a shadow 3. Close it Actual Results: The shadow of the tooltip / panel / anything remains. Expected Results: The shadow should go away with the content. Folderview is being used as a desktop. xubuntu 15.10 + kubuntu-desktop
Created attachment 95490 [details] The bug in action
Maybe related? #355332
*** This bug has been marked as a duplicate of bug 320892 ***