SUMMARY Latest Telegram desktop client (5.2+) doesn't update damaged screen regions on kwin-wayland. The bug was reported to Telegram developers and their reply was: This means your compositor has a bugged implementation of damage tracking with fractional scaling. I don't think disabling fractional scaling support or partial damage support just because old distros have bugs is a good idea so I think you should either switch to a distro with latest Plasma or report the bug to kwin package via your distro bugtracker. https://github.com/telegramdesktop/tdesktop/issues/28113#issuecomment-2203232661 STEPS TO REPRODUCE 1. Run latest Telegram desktop in Wayland session. 2. Scroll a chat or open any menu. OBSERVED RESULT Parts of Telegram window are not updated. EXPECTED RESULT Program window should be updated according to user interaction. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13
> I think you should either switch to a distro with latest Plasma Yep, good advice. :) Fractional scaling support on Wayland has hugely improve since 5.27.