https://bugs.kde.org/show_bug.cgi?id=522701
Bug ID: 522701
Summary: Task Manager shows wrong application's
icon/title/thumbnail for an unrelated running window
Classification: Plasma
Product: plasmashell
Version First 6.6.4
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Task Manager and Icons-Only Task Manager widgets
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
Created attachment 194052
--> https://bugs.kde.org/attachment.cgi?id=194052&action=edit
Screenshot showing the wrong icon in the taskbar.
DESCRIPTION
I am developing a Python/Qt6 app. When I launch it, I get the wrong icon in the
taskbar.
STEPS TO REPRODUCE
1. Have Vorta (backup tool) running in the background (tray-only,
StartupWMClass=python3 per its .desktop file)
2. Launch an unrelated custom Qt/PySide6 application (WM_CLASS "sticky-notes",
distinct PID, distinct D-Bus StatusNotifierItem registration)
3. Observe the Task Manager (taskbar)
Observed: A taskbar entry appears labeled "Vorta" with Vorta's icon, but its
live thumbnail preview shows the other application's window content.
Double-clicking this entry shows/hides the other app's window, not Vorta's —
proving the entry is functionally bound to the wrong window.
Additional notes:
Confirmed both apps have fully distinct WM_CLASS, PID, and D-Bus
StatusNotifierItem registrations (no collision at that layer)
Persists across a full logout/login (rules out simple stale-cache theory)
Persists even after fully quitting Vorta (rules out a ghost/zombie-window
theory — the entry stays bound to the live window)
Removing/re-adding the System Tray widget had no effect (confirms this is the
Task Manager widget, not System Tray)
Expected: Each taskbar entry should show the correct title/icon/thumbnail for
its own window.
SOFTWARE/OS VERSIONS
Operating System: Nobara Linux 43 (KDE Plasma Desktop Edition),
KDE Plasma Version: Plasma 6.6.4
KDE Frameworks Version: 6.25.0
Qt Version: 6.10.3
ADDITIONAL INFORMATION
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