Although no additional artifacts appeared after several hours or so, first I restarted plasma-desktop, it had no effect on the artifact. Then I restarted kwin (kwin --replace). The artifact went away.
See attached. ** Attachment added: "xprop.txt" https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1366647/+attachment/4200301/+files/xprop.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1366647 Title: Artifact left on screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1366647/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
