Created attachment 126191 [details] message preview window SUMMARY When selecting message in kmail2 for preview the color artefacts appears in both when html preview selected or text Glitches appeared after last kde neon 5.18.1 upgrade. STEPS TO REPRODUCE 1. Open Kmail 2. Select message OBSERVED RESULT Observe message preview. Picture in attachment EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION