I added the code below to the collectionview using UICollectionViewDiffableDataSource.
However, I can not drag the cells. (mysteriously, I can drag cells on Mac Catalyst)
What is missing?
dataSource.reorderingHandlers.canReorderItem = { item in return true }
dataSource.reorderingHandlers.didReorder = { [weak self] transaction in
		guard let self = self else { return }
		
		if let updatedBackingStore = self.backingStore.applying(transaction.difference) {
				self.backingStore = updatedBackingStore
		}
}
frnkwk
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