Created attachment 156121 [details] video record SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Choose a color (Satruation isn't 0%). 2. Click on the Value bar and slide in a wide range repeately, for example, from 80% to 20% and then return to 80%. See attachment for details. OBSERVED RESULT Saturation and Hue shakes when sliding on Value bar. Usually, the saturation will continue to rise to 100% after sliding for several times. Hue will remain stable when it's at 0°/60°/180°/240°. EXPECTED RESULT Saturation and Hue should not be affected by the change of Value. SOFTWARE/OS VERSIONS Windows: Windows 10 macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: 5.12.12