broken_swiftui_layout.swift

// BUG: FB7635852

import SwiftUI

struct ContentView: View {
  let count: Int

  var body: some View {
    HStack
      .init(alignment: .top, spacing: 0) {
        Color
          .red
          .border(Color.black)
          .alignmentGuide(.top) { d in
            50
          }
          .overlay(
            GeometryReader { proxy in
              if proxy.size.height > 100 {
                Text("BROKEN")
                  .fontWeight(.heavy)
                  .fixedSize()
                  .rotationEffect(.degrees(-90), anchor: .center)
                  .frame(width: proxy.size.width, height: proxy.size.height)
              }
            }
          )

        ForEach(0..<count, id: \.self) { index in
          Color
            .orange
            .border(Color.black)
            .overlay(Text("\(index)"))
        }
      }
      .border(Color.blue)

      .frame(width: 800, height: 100)
      .border(Color.purple)
  }
}

func preview(_ range: Range<Int>) -> some View {
  ForEach
    .init(range, id: \.self) { index in
      ContentView(count: index)
    }
    .previewLayout(.fixed(width: 900, height: 400))
}

struct ContentView_Previews_1: PreviewProvider {
  static var previews: some View {
    preview(0 ..< 8)
  }
}

struct ContentView_Previews_2: PreviewProvider {
  static var previews: some View {
    preview(8 ..< 16)
  }
}

struct ContentView_Previews_3: PreviewProvider {
  static var previews: some View {
    preview(16 ..< 24)
  }
}

struct ContentView_Previews_4: PreviewProvider {
  static var previews: some View {
    preview(24 ..< 32)
  }
}