boundarySupplementaryItems

[Nig0l]

if you change layout dynamically and those layouts have headers than the content offset of a collection after animation and correct drawing suddenly jumps to incorrect value.
do know how to resolve this issue or its normal behaviour:)?
as an example I've made small changes to SimpleGridViewController

override func createLayout() -> UICollectionViewLayout {
        let itemSize = NSCollectionLayoutSize(
            widthDimension: .fractionalWidth(gridItemSize.rawValue),
            heightDimension: .fractionalHeight(1.0)
        )
        let item = NSCollectionLayoutItem(layoutSize: itemSize)
        item.contentInsets = NSDirectionalEdgeInsets(top: 5, leading: 5, bottom: 5, trailing: 5)
        let groupSize = NSCollectionLayoutSize(
            widthDimension: .fractionalWidth(1.0),
            heightDimension: .fractionalWidth(gridItemSize.rawValue)
        )
        let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item])
        let section = NSCollectionLayoutSection(group: group)
        
        let headerSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(44))
        let headerElement = NSCollectionLayoutBoundarySupplementaryItem(layoutSize: headerSize, elementKind: UICollectionView.elementKindSectionHeader, alignment: .top)
        section.boundarySupplementaryItems = [headerElement]
        
        let layout = UICollectionViewCompositionalLayout(section: section)
        return layout
    }

[Nig0l]

have found the reason of that issue:
.estimated(44) makes this mess
use absolute value : )

[nemecek-filip]

Great! Glad to hear!