OSX Incorrect width for headers and footers

[christoff-1992]

The headers and footers width are not displaying the correct width.

[argentounce]

It also happens in iOS. I found that if you comment headerReferenceSize it works as expected. Previously it was needed. Hope it helps

let l = VerticalBlueprintLayout(itemsPerRow: 1,
                                height: 160,
                                minimumInteritemSpacing: 20,
                                minimumLineSpacing: 20,
                                sectionInset: .zero,
                                stickyHeaders: true
)

//        l.headerReferenceSize = CGSize(width: 1, height: 60)
l.sectionInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)

return l