Add a lazy stack playground with ten thousand rows

Author: colemancda

Demo/App.swiftpm/Sources/LazyStackPlaygrounds.swift

@@ -0,0 +1,36 @@
+#if canImport(AndroidSwiftUI)
+import AndroidSwiftUI
+#else
+import SwiftUI
+#endif
+
+struct LazyStackPlayground: View {
+    var body: some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text("LazyHStack — 500 items")
+            LazyHStack(spacing: 8) {
+                ForEach(0..<500, id: \.self) { index in
+                    Text("\(index)")
+                        .foregroundColor(.white)
+                        .padding()
+                        .background(Color.blue)
+                        .cornerRadius(6)
+                }
+            }
+            .frame(height: 64)
+
+            Text("LazyVStack — 10,000 rows")
+            // The ScrollView hands scrolling to the lazy stack, which only
+            // materializes the rows on screen.
+            ScrollView {
+                LazyVStack(alignment: .leading, spacing: 10) {
+                    ForEach(0..<10_000, id: \.self) { index in
+                        Text("Row \(index)")
+                    }
+                }
+            }
+        }
+        .padding()
+        .navigationTitle("Lazy Stacks")
+    }
+}