SUMMARY If I have some application which would usually cause kwin to disable compositing, but I have this app configured with window and app rules to not block compositing, the first icon in the icons-only task manager will look distorted (see picture). STEPS TO REPRODUCE 1. Launch some app that would usually block compositing (such as tauon music player), but set window and app rules for it to not block compositing. Perhaps restart the app if necessary for these rules to kick in. 2. Start launching apps so that the icons-only task manager gets more icons until it needs to shrink them. 3. Watch the first icon in the task manager. OBSERVED RESULT Icon is distorted (only the first one, rest are Ok). EXPECTED RESULT Icon should render normally. SOFTWARE/OS VERSIONS Operating System: Debian GNU/Linux KDE Plasma Version: 5.23.0 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 Kernel Version: 5.14.0-3-amd64 (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor Memory: 15.5 GiB of RAM Graphics Processor: AMD VEGA10 ADDITIONAL INFORMATION
Created attachment 142649 [details] icon_out_of_place Example of distorted icon. As soon as I close the app with rules, this icon suddenly becomes normal.
As yet another issue, the top corners of system notification pop-ups are not rounded while there's a running app with these rules. The issue with the first icon and with non-rounded notification corners will BTW persist even if said app does not have a window (just minimized in the system tray).
This bug was reported against an outdated version of KWin. We have made many changes since the. If the issue persists in newer versions can you reopen the bug report updating the version number.