iOS 16-compatible SwiftUI equivalent of cellLayoutMarginsFollowReadableWidth

SafeAreaInsetsFollowReadableWidth.swift

import SwiftUI

private struct SafeAreaInsetsFollowReadableWidthModifier: ViewModifier {
    static let readableWidth: Double = 672

    @ViewBuilder
    func body(content: Content) -> some View {
        GeometryReader { geometry in
            let insetLength = max(0, geometry.size.width - Self.readableWidth) / 2

            content
                .safeAreaInset(edge: .leading, spacing: 0) {
                    Color.clear.frame(width: insetLength)
                }
                .safeAreaInset(edge: .trailing, spacing: 0) {
                    Color.clear.frame(width: insetLength)
                }
        }
    }
}

public extension View {
    func safeAreaInsetsFollowReadableWidth() -> some View {
        self.modifier(SafeAreaInsetsFollowReadableWidthModifier())
    }
}