SUMMARY On Wayland, the message viewer in the main window of kmail displays either a black screen or the desktop (it is transparent). I use the Breeze default window theme. STEPS TO REPRODUCE 1. Start Plasma Wayland 2. Start Kmail 3. OBSERVED RESULT Message viewer is a black rectangle or shows what's beneath EXPECTED RESULT Message viewer should display the message. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.17.2 KDE Frameworks Version: 5.64 Qt Version: 5.13.2 ADDITIONAL INFORMATION Arch Linux
Have the same issue with KDE Neon 5.17.3 with latest packages. The software versions are: KDE Plasma Version: 5.17.3 KDE Frameworks Version: 5.64.0 Qt Version: 5.13.2 Kernel Version: 5.0.0.17-generic The preview doesn't work in Kmail (also when Kmail is opened within Kontact), opening the mail in new window shows the proper content. Changing Composer setting didn't help. The graphics driver in use is i915.
*** This bug has been marked as a duplicate of bug 397825 ***