SUMMARY Maximizing the window while the panel is floating causes weird glitches all over the screen. It looks like the maximized window doesn't render because of the floating panel, but Plasma thinks it's rendering, which doesn't clear the buffer and results in such weird artifacts from other windows. This issue appears for every maximized window (X11 and XWayland), and interestingly, a full-screen window works fine. Snapping the window to the side (half-width / full-height) also works. This is annoying because it also affects games that run as a borderless window. [Look for screen recording in ADDITIONAL INFORMATION] STEPS TO REPRODUCE 1. Create bottom panel with "Floating=enabled" and "Visibility=always visible" 2. Arrange the windows so that they do not cover the panel and panel is floating 3. Maximize window OBSERVED RESULT Whole screen is messed up EXPECTED RESULT Window is properly maximized SOFTWARE/OS VERSIONS Operating System: Fedora Linux 40 KDE Plasma Version: 6.1.1 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.1 Kernel Version: 6.9.6-200.fc40.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor Memory: 31.3 GiB of RAM Graphics Processor: AMD Radeon RX 6900 XT Manufacturer: Micro-Star International Co., Ltd. Product Name: MS-7C37 System Version: 2.0 ADDITIONAL INFORMATION It is difficult to describe this error in more detail, so I am providing a link to the screen recording. https://drive.proton.me/urls/7XD720JMKC#hY30VQoeH3An
Created attachment 171483 [details] Screen recording, showing glitches when maximizing a window I also encountered the issue on Arch Linux + Plasma 6.1.2 + Wayland. I have two screens. It only happened on the screen with the panel. And disabling floating panel solves the bug.
floatimg panels work different now (the actual window never moves or resizes anymore), avoiding this problem