This seems to be resolved in 4:5.19.5-3
- Bug#974212: kwin-x11 crashes, windows missing decorations Karsten Hilbert
- Bug#974212: kwin-x11 crashes, windows missing decorat... Tim Sattarov
- Bug#974212: Info received (kwin-x11 crashes, windows ... Tim Sattarov
- Bug#974212: Acknowledgement (kwin-x11 crashes, window... Karsten Hilbert
