More sophisticated CollectionRangeLookup

Right now, when the collection, which is datasource of CollectionRangeLookup change, the CollectionRangeLookup creates a new collection.

Real issue is, that i use combination of CollectionRangeLookup and GameObjectItemsSetter.

GameObjectItemsSetter has a provider CollectionRangeLookup which takes forst X from Collection.

public class GameObjectItemsSetter : ItemsSetter
{
protected override void ClearItems()
protected override void CreateItem(object itemContext, int itemIndex)
}

Problem is, that every time something change in the Collection, the CollectionRangeLookup creates a new Collection. New collection triggers ClearItems on CollectionRageLookup() and then multiple CreateItem calls within them the created gameobjects are instantiated and reset for a brief moment. That looks really bad.

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