reproducible on Arch Linux (plasma 5.13 beta) and neon dev unstable open dolphin hover some button in window decoration and wait for its tooltip while the tooltip is visible, press ctrl+q to close dolphin the tooltip takes some seconds to disappear
Possible patch at: https://phabricator.kde.org/D13299
Git commit c44adda40f47418ce6eea974b2a3c3b1e77fa205 by Martin Flöser. Committed on 10/06/2018 at 07:18. Pushed by graesslin into branch 'Plasma/5.13'. Hide decoration tooltip when the decoration gets destroyed Summary: FIXED-IN: 5.13.1 Test Plan: Manual testing Reviewers: #kwin, #plasma Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D13299 M +8 -1 decorations/decoratedclient.cpp M +1 -0 decorations/decoratedclient.h https://commits.kde.org/kwin/c44adda40f47418ce6eea974b2a3c3b1e77fa205