SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** 1. Have Plasma 5.27.5 2. Open a GTK app that uses CSD such as Lollypop OBSERVED RESULT GTK apps don't have a border EXPECTED RESULT The GTK theme should match the Breeze kdecoration which now has a border SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.27.5 KDE Frameworks Version: 5.106.0 Qt Version: 5.15.9 ADDITIONAL INFORMATION
Unfortunately this is not feasible due to the inherent differences between server-side decoration apps (e.g. KDE apps) and client-side-decoration apps (e.g. GNOME apps). Anything we could do here would be a huge hack that would randomly break all the time and not work properly for many CSD apps.
Oh that's unfortunate, thank you for the reply.