*** 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 Arranging the pinned apps in the Icon-Only Task Manager is difficult. After a while not the clicked icon but the previous, or some other one is moved. I don't see an explicit pattern here. STEPS TO REPRODUCE 1. Add the icon only Task Manager to a panel 2. Pin multiple applications to it (I have 11) 3. Have them open (not sure if it is a hard requirement) 4. Start rearing them. OBSERVED RESULT After some rearangement, the panel does not move the one I clicked to move, but the one I last moved. Also the icon being dragged are not always the same as the one moving around. EXPECTED RESULT Move the icons that I click. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.1.1 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.2 Kernel Version: 6.9.7-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i7-11370H @ 3.30GHz Memory: 31,1 GiB of RAM Graphics Processor: Mesa Intel® Xe Graphics Manufacturer: TUXEDO Product Name: TUXEDO InfinityBook Pro 14 Gen6 ADDITIONAL INFORMATION It reminds me of the time when in the Launcher, if you moved an icon, you cannot move anything else and have to close it and open again to continue rearanging. Thank you for looking into it!
Now I see, that it can be seen that "something is off", as the highlighting also does not work. Clicking on one of the icons, fixes it, so the icon highlight starts to work and the clicked icon can be moved around. I think until it is not done, the same icon will be moved always.
I don't rearrange my taskbar too often, but when I wanted to replace one icon today I discovered this bug and can confirm that it can be reproduced on KDE Plasma 6.1.3 (Wayland) running on Fedora Workstation 40. Sometimes, as OP mentioned, a previously moved icon get "stuck to the cursor" and the last moved icon moves instead of the one you're trying to move next. In this case I noticed that clicking right mouse button several times fixes the issue (probably clicking anything would "unstick" it from the cursor). Also, it appears that sometimes, when you drag and drop a longer distance (>2 spots), suddenly the pinned app you're dragging changes to a different app, that was in between of where you started dragging and where you stopped.
Created attachment 172452 [details] Video showing the bug I've attached a video showing described issue
I'm pretty sure this is caused by Bug 491100. We fixed an earlier drag-and-drop issue in Qt (which you have), and it exposed this one. *** This bug has been marked as a duplicate of bug 491100 ***