On High-DPI screen with scaling 150%, maximizing windows lets a 1-pixel high line uncovered at the top of the screen. I can see the top line of my desktop wallpaper. This happens under Wayland. STEPS TO REPRODUCE 1. Have KDE installed and a high-DPI screen 2. Open a Wayland session, set scaling to 150% 3. maximize a window OBSERVED RESULT The window does not cover the screen exactly to the top. A line 1 pixel high stays uncovered by the maximized window. EXPECTED RESULT The maximized window should cover the whole screen. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.73.0 Qt Version: 5.15.0 Kernel Version: 5.8.6-1-MANJARO Graphics Processor: Mesa Intel UHD Graphics 620
Created attachment 137715 [details] Screenshot of Wayland on Plasma 5.21.4 with 1px transparent line on top of maximized window, and to left of titlebar I also get this on Wayland with 250% scaling. For me there is also a 1px line on the left edge of the Breeze titlebar. In the attached screenshot the line appears purple as this is the colour of the standard Plasma 5.21 wallpaper behind.
It also occurs at 200%
Operating System: openSUSE Leap 15.2 KDE Plasma Version: 5.21.4 KDE Frameworks Version: 5.81.0 Qt Version: 5.15.2 Kernel Version: 5.3.18-lp152.72-preempt OS Type: 64-bit Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz Memory: 31.2 GiB of RAM Graphics Processor: Mesa DRI Intel® HD Graphics 630
Cannot reproduce on Wayland FWIW.
The renderer in the drm backend used to calculate the viewport size as logical size * scale, it was changed a while ago and it uses the mode size, so this bug should be fixed.