Bug 482932

Summary:	Combo-box does not correctly handle high-resolution scroll wheel, treating fractional step as discrete
Product:	[Frameworks and Libraries] frameworks-qqc2-desktop-style	Reporter:	zvova7890
Component:	general	Assignee:	kdelibs bugs <kdelibs-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	ahiemstra, kde, nate, noahadvs, notmart
Priority:	NOR	Keywords:	qt6
Version First Reported In:	6.0.0
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description zvova7890 2024-03-08 23:45:24 UTC

SUMMARY
When you scroll over the combo-box, it jumps not to the next item, but to the item equal to the count of fractional steps instead of discrete steps. For example, in ksystemsettings -> display -> Refresh rate combo.

STEPS TO REPRODUCE
1. Open ksystemsettings -> display
2. Scroll over Refresh rate combo box

OBSERVED RESULT
Jumps to the item equal to the count of fractional steps.

EXPECTED RESULT
Jump to the item equal to the count of discrete steps.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.8-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 7940HS w/ Radeon 780M Graphics
Memory: 28,2 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: Micro Computer (HK) Tech Limited
Product Name: Venus series

Comment 1 zvova7890 2024-03-09 21:47:25 UTC

Looks like it is a Qt6 bug. The widget's combo box is also flying around using fractional steps...

Comment 2 zvova7890 2024-03-11 20:59:05 UTC

Nope, Qt6 quick controls handle this differently, more accurately. But still not perfect: https://bugreports.qt.io/browse/QTBUG-123179

So this report is actual for kirigami framework.