[kde] [Bug 497551] New: Incompatible widgets don't allow choosing alternative after update

[David]

https://bugs.kde.org/show_bug.cgi?id=497551

            Bug ID: 497551
           Summary: Incompatible widgets don't allow choosing alternative
                    after update
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: david.cortes.rivera at gmail.com
  Target Milestone: ---

SUMMARY
If I have some widget from KDE5 as some standardized function like "launcher"
or "system clock", and this widget is not compatible with KDE6, then after
updating to KDE6, it will not let me select "alternatives" for it anymore.

Getting a widget for the same function (e.g. launcher) requires removing said
widget from the system panel and adding a new one instead, which has the side
effect of **deleting the user's config** for it, thereby preventing one from
updating the widget while keeping the same config.

STEPS TO REPRODUCE
1. Install a KDE version from the 5 series.
2. Install a custom widget for application launcher, such as this one:
https://github.com/adhec/OnzeMenuKDE
3. Configure said widget to be your application launcher, by right-clicking the
current one, selecting 'Show Alternatives', and choosing that 'Onze Menu'..
4. Upgrade everything to KDE6.
5. Restart computer.

OBSERVED RESULT
The widget doesn't work, and it doesn't let me select an alternative for
application launcher when right-clicking it. It's worse when it's a highly
customizable widget that has updates for KDE6, such as this other one:
https://github.com/orblazer/plasma-applet-resources-monitor ; as then removing
it loses one's config.

EXPECTED RESULT
Should at the very least let me choose an alternative for the launcher / clock
/ etc. if the current one doesn't work anymore. Ideally, should offer me to
update if there's a new version supporting the latest QML / KF / etc.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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