NSView Subviews interrupting drag operation

Question

I have an NSView which is registered for a drag operation.

In that view I have a subclassed NSScrollView, which in itself has an NSImageView in it.

When drag

Answer 1

Oh, thanks so much @Steven!

Swift 4.2 and @IBOutlets:

@IBOutlet private weak var imageView: NSImageView! {
  didSet {
    imageView.unregisterDraggedTypes()
  }
}

Long story:
I had this NSCollectionView, which loaded a custom NSCollectionViewItem from a XIB file.

The collection accepts drop operations (collectionView.registerForDraggedTypes([.fileURL])).
But as soon as something was dropped into it and the custom cell was "dequeued" (makeItem(withIdentifier:for:)) -- drop operations stopped working above that specific cell.

unregisterDraggedTypes() fixes the issue indeed.