Created attachment 169817 [details] video. scrolling fast in plasmashell kickoff with ctrl pressed *** If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** SUMMARY STEPS TO REPRODUCE 1. open systemsettings(only reproduceable in plasmashell, systemsettings and kinfocenter 2. scroll very fast(or scroll with CTRL pressed 3. OBSERVED RESULT sometimes it scrolls out of the range EXPECTED RESULT SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.2.0 Qt Version: 6.7.0 Kernel Version: 6.8.8-zen1-1-zen (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 6800H with Radeon Graphics Memory: 14.3 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: TIMI Product Name: Redmi Book Pro 15 2022 ADDITIONAL INFORMATION see the video
When originY is not 0, this bug happens.
when scrolling in these apps, originY is always changing. Making it always 0 instead of reading the real property fixes this.
You mean the readings of originY in the wheelhandler.cpp, right? I can see how it could be problematic, since originY might the result of estimations based on currently visible delegates + section delegates + header + footer sizes. My old but related MR: https://invent.kde.org/frameworks/kirigami/-/merge_requests/977
Created attachment 171571 [details] debug output
here's some debug output. in scrollFlickable() ``` std::cout << "\nheight=" << height << " ; contentHeight=" << contentHeight << "\ncontentY=" << contentY << " ; topMargin=" << topMargin<< "\nbottomMargin=" << bottomMargin << " ; originY=" << originY << "\nminYExtent=" << topMargin << "-" << originY << "=" << minYExtent<< "\nmaxYExtent=" << height << "-(" << contentHeight << "+" << bottomMargin << "+" << originY << ")=" << maxYExtent << "\n"; ```
when scrolling, the scroll bar's length is always changing