Bug 512147

Summary: Application windows appear on second monitor task manager when dragging it near the bottom edge on main monitor.
Product: [Plasma] plasmashell Reporter: Bartosz <boa.bartek>
Component: Task Manager and Icons-Only Task Manager widgetsAssignee: Plasma Bugs List <plasma-bugs-null>
Status: CONFIRMED ---    
Severity: normal CC: kdedev, qydwhotmail
Priority: NOR Keywords: multiscreen
Version First Reported In: 6.5.2   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Video showing the issue.
Display configuration settings
Icons-and-text Task Manager Settings

Description Bartosz 2025-11-15 18:35:42 UTC
Created attachment 186816 [details]
Video showing the issue.

SUMMARY
I have a two monitor setup, where the second monitor is slightly lower both physically and virtually (screenshot in attachments). On both monitor I have task manager widgets set to only show tasks from current screen. When on the main monitor I try to move an application window near the bottom edge it appears on the right's monitor task manager even though the window is still on the left window. Video showing the issue in attachments. 

STEPS TO REPRODUCE
1. In two monitor setup have one monitor to be set slightly lower in Plasma settings. 
2. On both monitors have task manager widgets set to only show tasks from the current screen. 
3. On the main screen move an application window near the bottom edge. 

OBSERVED RESULT
Application window appears on the second monitor task manager even though it is still on the main screen. 

EXPECTED RESULT
Properly display tasks only from the current screen in the task manager widget.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.2
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.7-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 580 Series
Comment 1 Bartosz 2025-11-15 18:36:08 UTC
Created attachment 186817 [details]
Display configuration settings
Comment 2 Bartosz 2025-11-15 18:36:29 UTC
Created attachment 186818 [details]
Icons-and-text Task Manager Settings
Comment 3 TraceyC 2025-11-21 20:02:47 UTC
Thanks for the detailed report! The screenshots and screen recording are very helpful.

On Plasma built from git-master, I am able reproduce this exact behavior.
moving the window on the bottom left side of the primary left display does not trigger the bug, but moving it to the lower right does