I don't understand the idea behind the current ListView implementation :-(
Actually the ItemList is always created, and IMO also populated. This would make sense only when the widget is in OwnerData mode, otherwise the widget will duplicate all items.
It may make sense to manage the items in a local ItemList, but then the widget should always be in OwnerData mode. OTOH the local ItemList defeats the use of OwnerData, managed by the application outside the control.
In any case a redesign is suggested, that allows for true (application) OwnerData mode, where no items are stored in the control or widget, and a non-OwnerData mode with items stored in the control *or* in the widget (but not both).
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