Bug 485967

Created attachment 168802 [details]
Depiction of the problem.

SUMMARY
Line numbers in Konsole render with a gap between them and seemingly random numbers to their right when the user scrolls from a large line number value to a small one. They disappear when the focus of the scrollbar is returned.

STEPS TO REPRODUCE
1.  Install the Fedora 40 Beta KDE Spin from https://download.fedoraproject.org/pub/fedora/linux/releases/test/40_Beta/Spins/x86_64/iso/Fedora-KDE-Live-x86_64-40_Beta-1.10.iso
2.  Install konsole-24.02.2-1.fc40.x86_64.rpm from https://kojipkgs.fedoraproject.org//packages/konsole/24.02.2/1.fc40/x86_64/konsole-24.02.2-1.fc40.x86_64.rpm
3.  Enable "Always" mode, as https://discuss.kde.org/t/how-to-enable-line-numbers-in-konsole/14435#always-3 describes.

OBSERVED RESULT
The line numbers render with a gap between them and seemingly random numbers to their right when the user scrolls from a large line number value to a small one. They disappear when the focus of the scrollbar is returned.

EXPECTED RESULT
This artefact shouldn't be present whilst scrolling.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.7-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon RX 5700
Manufacturer: ASRock
Product Name: X670E Taichi