From 755d05700903ed5e370d7896cd13b64066836721 Mon Sep 17 00:00:00 2001
From: Kyle <kyle201817146@gmail.com>
Date: Sat, 18 Oct 2025 16:07:16 +0800
Subject: [PATCH 1/2] Update ZIndex implementation

---
 Sources/OpenSwiftUICore/Layout/Stack/ZIndex.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sources/OpenSwiftUICore/Layout/Stack/ZIndex.swift b/Sources/OpenSwiftUICore/Layout/Stack/ZIndex.swift
index fa6c93623..56d79f9b9 100644
--- a/Sources/OpenSwiftUICore/Layout/Stack/ZIndex.swift
+++ b/Sources/OpenSwiftUICore/Layout/Stack/ZIndex.swift
@@ -2,9 +2,10 @@
 //  ZIndex.swift
 //  OpenSwiftUICore
 //
-//  Audited for 6.0.87
+//  Audited for 6.5.4
 //  Status: Complete
 
+@available(OpenSwiftUI_v1_0, *)
 extension View {
     /// Controls the display order of overlapping views.
     ///
@@ -39,6 +40,8 @@ extension View {
     }
 
 }
+
+@available(OpenSwiftUI_v1_0, *)
 @usableFromInline
 package struct ZIndexTraitKey: _ViewTraitKey {
     @inlinable

From 5ce4276a933b80d31cd86253c29a5510f8c6e2de Mon Sep 17 00:00:00 2001
From: Kyle <kyle201817146@gmail.com>
Date: Sat, 18 Oct 2025 18:08:18 +0800
Subject: [PATCH 2/2] Update ZIndex test case

---
 .../Layout/Stack/ZStackIndexUITests.swift     | 40 +++++++++++++++++++
 .../Layout/ZIndexTests.swift                  | 14 +++----
 2 files changed, 46 insertions(+), 8 deletions(-)
 create mode 100644 Example/OpenSwiftUIUITests/Layout/Stack/ZStackIndexUITests.swift

diff --git a/Example/OpenSwiftUIUITests/Layout/Stack/ZStackIndexUITests.swift b/Example/OpenSwiftUIUITests/Layout/Stack/ZStackIndexUITests.swift
new file mode 100644
index 000000000..dcad0457d
--- /dev/null
+++ b/Example/OpenSwiftUIUITests/Layout/Stack/ZStackIndexUITests.swift
@@ -0,0 +1,40 @@
+//
+//  ZIndexCompatibilityTests.swift
+//  OpenSwiftUICompatibilityTests
+
+import Foundation
+import Testing
+import SnapshotTesting
+
+@MainActor
+@Suite(.snapshots(record: .never, diffTool: diffTool))
+struct ZStackIndexUITests {
+    @Test
+    func zIndexExample() {
+        struct ContentView: View {
+            var body: some View {
+                VStack {
+                    // TODO: Path & Shape is not implemented yet.
+                    Color.yellow
+//                    Rectangle()
+//                        .fill(Color.yellow)
+                        .frame(width: 100, height: 100, alignment: .center)
+                        .zIndex(1) // Top layer.
+                    Color.red
+//                    Rectangle()
+//                        .fill(Color.red)
+                        .frame(width: 100, height: 100, alignment: .center)
+                        .rotationEffect(.degrees(45))
+                        // Here a zIndex of 0 is the default making
+                        // this the bottom layer.
+                }
+            }
+        }
+        withKnownIssue {
+            openSwiftUIAssertSnapshot(
+                of: ContentView(),
+                size: CGSize(width: 200, height: 200)
+            )
+        }
+    }
+}
diff --git a/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift b/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
index 2cda207d6..8924eef12 100644
--- a/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
+++ b/Tests/OpenSwiftUICoreTests/Layout/ZIndexTests.swift
@@ -3,19 +3,17 @@
 //  OpenSwiftUICoreTests
 
 import OpenAttributeGraphShims
+@_spi(ForOpenSwiftUIOnly)
 import OpenSwiftUICore
 import Testing
 
 @MainActor
 struct ZIndexTests {
     @Test
-    func indexOrder() {
-        struct ContentView: View {
-            var body: some View {
-                Color.red
-                    .zIndex(0.5)
-            }
-        }
-        // TODO: Add a test helper to hook into makeViewList and retrieve the zIndex value to verify it
+    func traitCollectionZIndex() {
+        var collection = ViewTraitCollection()
+        #expect(collection.zIndex.isApproximatelyEqual(to: 0.0))
+        collection.zIndex = 1.5
+        #expect(collection.zIndex.isApproximatelyEqual(to: 1.5))
     }
 }