Bug 447204

Summary: Task manager offers to launch new instance of kcmshell and systemsettings
Product: [Plasma] plasmashell Reporter: Nicolas Fella <nicolas.fella>
Component: Task Manager and Icons-Only Task ManagerAssignee: Eike Hein <hein>
Status: RESOLVED FIXED    
Severity: normal CC: justin.zobel, plasma-bugs
Priority: NOR    
Version: master   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=429428
Latest Commit: https://invent.kde.org/plasma/plasma-workspace/commit/c58e5433436393e2b437ccb34f375b5aacb6419c Version Fixed In:
Sentry Crash Report:

Description Nicolas Fella 2021-12-18 20:21:54 UTC 
STEPS TO REPRODUCE
1. Run kcmshell5 autostart or kcmshell5 kdeconnect 
2. Right-click on the task manager icon
3. Click "Start new instance"

OBSERVED RESULT
for kdeconnect nothing happens
for autostart the error "The file or folder kcmshell doesn't exist" appears


EXPECTED RESULT
KCMs are inherently single-instance so it should not offer to launch a new instance in the first place.
The same applies to systemsettings, which is also a single instance app


SOFTWARE/OS VERSIONS
Everything master
Comment 1 Nicolas Fella 2021-12-18 20:57:26 UTC 
With https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/1288 and https://invent.kde.org/plasma/kde-cli-tools/-/merge_requests/25 clicking "New instance" on a kcmshell window opens systemsettings with that KCM, which is a bit less broken than showing an error but is still quite odd
Comment 2 Bug Janitor Service 2021-12-18 21:35:51 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/1289
Comment 3 Friedrich W. H. Kossebau 2021-12-21 19:50:49 UTC 
*** Bug 429428 has been marked as a duplicate of this bug. ***
Comment 4 Nicolas Fella 2021-12-25 00:19:36 UTC 
Git commit c58e5433436393e2b437ccb34f375b5aacb6419c by Nicolas Fella.
Committed on 25/12/2021 at 00:11.
Pushed by nicolasfella into branch 'master'.

[libtaskmanager] Prevent launching a new instance of services with NoDisplay=true

It is not possible for the user to launch such an app from the UI, so we should not allow to launch a new instance from the task manager context menu.

M  +15   -0    libtaskmanager/tasktools.cpp

https://invent.kde.org/plasma/plasma-workspace/commit/c58e5433436393e2b437ccb34f375b5aacb6419c