Qt 6.8 preparation: Qt::UniqueConnection can only be used with QObject member functions #25343
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This has been the case always, but only since a few Qt versions it causes an assertion failure.
This is my quick-and-dirty fix cherry-picked from #25016. I'm not sure if it is the simplest/cleanest thing we can do, but it is the closest equivalent to a capturing lambda (I seem to recall that that is under the hood treated as a class with the captures as member fields).
@Eism I'm aware that this may be obsoleted by your work on the KDDockWidgets 2.1 update; if that's the case, feel free to close this!
Resolves: #24716
Resolves: #25307