Review Request 123860: Handle backend being deleted during GetConfigOperation

[David Edmundson]

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https://git.reviewboard.kde.org/r/123860/
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Review request for Plasma and Solid.


Repository: libkscreen


Description
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GetConfigOperation stores a raw pointer to the backend in a property of
the QDBusPendingCallWatcher

BackendManager owns this backend and can delete it at will if it becomes
invalidated, leaving a dangling pointer in the watcher's property.

BUG: 347626


Diffs
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  src/getconfigoperation.cpp dac7a33edd87adb53d7b773acfe7f7dfe2229394 

Diff: https://git.reviewboard.kde.org/r/123860/diff/


Testing
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Never made the crash happen myself, but looking at the backtrace and the code it seems the a way it could have happened.

Tested behaviour as before still works.


Thanks,

David Edmundson

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