SUMMARY In a Plasma/Wayland session, with scaling set to anything above 100%, a flickering blue line is seen on menus between the items while moving through the items with the mouse. Also when using Midnight Commander in konsole, moving the bar around over different items, will leave line artifacts as well. This happens with Breeze and Adwaita for example, but not with the Fusion style which, otoh, seems rather sluggish and slow. STEPS TO REPRODUCE 1. Set scaling to anything above 100% (e.g. 150%) 2. Right click on the Plasma desktop 3. Move the mouse up and down in the menu the opened OBSERVED RESULT Flickering blue (full or partial) blue lines between the menu items. EXPECTED RESULT No flickering blue lines. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.26.90 KDE Frameworks Version: 5.104.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION Nvidia driver: 525.89.02 egl-gbm: 1.1.0 egl-wayland: 1.1.11-r1 Everything is compiled from yesterday's Qt-5 based git kde branches. This specific problem has been around for ages w/ the Nvidia driver at least.
1. Just tested w/ Nvidia drivers 530.30.02, nothing has changed at all. 2. When moving the mouse around the whole desktop while the menu is open with the blue lines, they will flicker with the movement of the mouse. If one stops moving the mouse, the flickering stops. 3. Desktop effects seemingly have no effect on this matter whatsoever.
*** This bug has been marked as a duplicate of bug 465158 ***