Created attachment 188761 [details] Issue on Plasma 6.5.5 STEPS TO REPRODUCE Launch an app that is pinned to the Panel and keep the cursor over it. OBSERVED RESULT With some apps, like Firefox and KDEnlive, the window preview appears in the wrong place. EXPECTED RESULT The should appear on next to the app's icon. SOFTWARE/OS VERSIONS Operating System: CachyOS Linux KDE Plasma Version: 6.5.5 KDE Frameworks Version: 6.22.0 Qt Version: 6.10.1 Kernel Version: 6.18.6-2-cachyos (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i5-11300H @ 3.10GHz Memory: 9 GB of RAM (8.1 GB usable) Graphics Processor 1: Intel® Iris® Xe Graphics Graphics Processor 2: NVIDIA GeForce GTX 1650 Manufacturer: LENOVO Product Name: 82MG System Version: IdeaPad Gaming 3 15IHU6
it might be an issue when the launcher gets removed and replaced with the actual task, in that case the tooltip which has only one instance loses the parent and gets positioned relative to the entire taskbar as visualparent. the tooltip should probably disappear in that case and it's what it's happening on horizontal panels. The bug seems to happen only on vertical panels
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/3474
Git commit 01ca0cca5b842a9076211ccc30c770d6117fbb67 by Marco Martin. Committed on 23/01/2026 at 08:19. Pushed by mart into branch 'master'. applets/taskmanager: fix implicitHeight Task implicitheight used to be incorrect in vertical panels, as it was defined as tasksRoot.height / Plasmoid.configuration.maxStripes which means the height of the total taskbar. This caused the task to be briefly too tall before its height was then limited by the gridlayout. sometimes this in turn caused the taskbar tooltip appear on the wrong place if the tooltip was shown right in the moment the task has wrong height. M +4 -2 applets/taskmanager/qml/Task.qml https://invent.kde.org/plasma/plasma-desktop/-/commit/01ca0cca5b842a9076211ccc30c770d6117fbb67
Git commit e66fd63b44dc4aeb5b959a13aef134c9622197a6 by Marco Martin. Committed on 23/01/2026 at 08:56. Pushed by mart into branch 'Plasma/6.6'. applets/taskmanager: fix implicitHeight Task implicitheight used to be incorrect in vertical panels, as it was defined as tasksRoot.height / Plasmoid.configuration.maxStripes which means the height of the total taskbar. This caused the task to be briefly too tall before its height was then limited by the gridlayout. sometimes this in turn caused the taskbar tooltip appear on the wrong place if the tooltip was shown right in the moment the task has wrong height. (cherry picked from commit 01ca0cca5b842a9076211ccc30c770d6117fbb67) 01ca0cca applets/taskmanager: fix implicitHeight Co-authored-by: Marco Martin <notmart@gmail.com> M +4 -2 applets/taskmanager/qml/Task.qml https://invent.kde.org/plasma/plasma-desktop/-/commit/e66fd63b44dc4aeb5b959a13aef134c9622197a6