https://bugs.kde.org/show_bug.cgi?id=454988

            Bug ID: 454988
           Summary: (Older?) widgets in the panel make plasmashell
                    misbehave
           Product: plasmashell
           Version: 5.24.5
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Panel
          Assignee: plasma-b...@kde.org
          Reporter: sergio.calleg...@gmail.com
                CC: niccolo.venera...@gmail.com
  Target Milestone: 1.0

SUMMARY

I am trying to use the system load viewer widget
(https://store.kde.org/p/1474921). This is indicated as usable in plasma <=5.20
because it relies on ksysguard that is phased out. However, arch and manjaro
provide ksysguard with plasma 5.24.5 and the widget seems to actually work.

What is strange is that the widget causes weird issues with the rest of plasma:

- Often at startup the system does not load the background image if the widget
is on the panel. Restarting the plasmashell causes the background image to load
correctly;

- The "add widget" action stops working if the widget is in the panel. No left
area with the available widgets is shown.

All this is not nice. Either, plasmashell should refuse to install code for a
widget that is not supported or, if it allows installing a widget then it
should not misbehave in these weird ways.


STEPS TO REPRODUCE
1. Add widget
2. Download and install widget "System load viewer"
3. Add widget to the bottom panel
4. log out and log in again
5. Try "add widget"... It does not work.

OBSERVED RESULT

Adding the widget to the panel causes weird and apparently unrelated faults in
plasma.

EXPECTED RESULT

Plasma should either refuse to install a widget or provide some error info if a
widget misbehaves, but should not behave itself erratically because of a widget
that may be coded according to older standards.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.94.0 
Qt Version: 5.15.4

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