STEPS TO REPRODUCE
1. start Wayland session
2. set icon-only task bar
3. open firefox and press ctrl+n to open another window (Firefox windows are grouped in the task bar)
4. click Firefox group in the task bar
vertical menu shows up instead of "present windows" effect
"present windows" effect is activated showing all grouped windows
Operating System: Arch Linux
KDE Plasma Version: 5.15.2
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1
*** This bug has been marked as a duplicate of bug 397153 ***
Apparently not a full duplicate of Bug 397153 since it's not working still. Marking it as a dependency instead.
*** Bug 426904 has been marked as a duplicate of this bug. ***
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/417
Git commit af93e38269779f34f8cc946520a0311f6f74cf78 by David Redondo.
Committed on 12/04/2021 at 12:55.
Pushed by davidre into branch 'master'.
Fix object path
M +1 -1 applets/taskmanager/plugin/backend.cpp