zindex ignored for UICollectionViewCompositionalLayout supplementary items

Number:rdar://FB9021736 Date Originated:2/26/21
Status: Resolved:
Product:UIKit Product Version:iOS 14
Classification: Reproducible:
Zindex is ignore in UICollectionViewCompositionalLayout supplementary items in sections with an orthogonal value other than .none.

In the project, I’ve set the zIndex of the red `tlBadge` to 2, both on the layout item itself and again in the `visibleItemsInvalidationHandler` - neither of those are consistently effective at moving the item forward. Also, I’ve provided a commented out ‘fix’ for rendering the badge in `OtherBadges`, but it only fixes the rendering and NOT the hit test.


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