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Code Review Complete

Tasks

• Review Unity version compatibility utility
• Review sample app changes
• Review CI/CD workflow changes
• Review UI Toolkit UXML migration patterns
• Check for security issues and external domains
• Post final review

Issue 1: Duplicate using statement in ListItem.cs

File: src/Reown.AppKit.Unity/Runtime/Components/ListItem.cs:1-4

using System;
using Reown.AppKit.Unity.Utils;
using UnityEngine;
using UnityEngine.UIElements;
using Reown.AppKit.Unity.Utils;  // Duplicate

Reown.AppKit.Unity.Utils is imported twice.

Issue 2: Potential memory leak in RegisterCallbackOnce compatibility shim

File: src/Reown.AppKit.Unity/Runtime/Utils/UnityVersionCompat.cs:20-36

The RegisterCallbackOnce fallback implementation for Unity versions < 6.0 captures onceCallback in a closure. If the callback throws an exception before UnregisterCallback is called, the event handler will remain registered permanently, causing a memory leak.

Recommendation: Wrap the callback invocation in try-finally:

onceCallback = evt =>
{
    try
    {
        callback(evt);
    }
    finally
    {
        element.UnregisterCallback(onceCallback);
    }
};

Issue 3: Missing null check in IsEscapeKeyPressed for New Input System

File: src/Reown.AppKit.Unity/Runtime/Utils/UnityVersionCompat.cs:59-70

public static bool IsEscapeKeyPressed()
{
#if ENABLE_INPUT_SYSTEM
    var keyboard = UnityEngine.InputSystem.Keyboard.current;
    return keyboard != null && keyboard.escapeKey.wasPressedThisFrame;

While the null check for keyboard exists, if keyboard is not null but escapeKey is null (unusual but theoretically possible in certain Unity configurations), this could throw a NullReferenceException.

Recommendation: Add defensive null check for escapeKey:

return keyboard != null && keyboard.escapeKey?.wasPressedThisFrame == true;

Issue 4: SetPlaceholder is no-op on Unity < 6.0 without user feedback

File: src/Reown.AppKit.Unity/Runtime/Utils/UnityVersionCompat.cs:44-52

The SetPlaceholder method silently does nothing on Unity versions before 6.0. This could confuse users who expect placeholder text to appear.

Recommendation: Add a compile-time warning or runtime debug log to inform developers that the feature is unavailable:

#else
    // Placeholder API not available in Unity versions before 6.0
    Debug.LogWarning($"TextField placeholder not supported in Unity {Application.unityVersion}. Upgrade to Unity 6+ for placeholder support.");
#endif

Issue 5: Trailing empty line in NetworkButton.cs

File: src/Reown.AppKit.Unity/Runtime/Components/NetworkButton.cs:89-91

UnityVersionCompat.RegisterCallbackOnce<GeometryChangedEvent>(this, _ => UpdateNetworkButton(AppKit.NetworkController.ActiveChain));
            

Clickable = new Clickable(() => AppKit.OpenModal(ViewType.NetworkSearch));

Double empty line (line 90-91) - inconsistent formatting.

Issue 6: Missing using directive for UnityEngine.InputSystem

File: src/Reown.AppKit.Unity/Runtime/Utils/UnityVersionCompat.cs:1-2

The file references UnityEngine.InputSystem.Keyboard.current but doesn't include the using directive. While the fully qualified name works, it's inconsistent with the rest of the codebase style.

Recommendation: Add conditional using directive:

#if ENABLE_INPUT_SYSTEM
using UnityEngine.InputSystem;
#endif

Then use Keyboard.current instead of UnityEngine.InputSystem.Keyboard.current.

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

Waiting for game-ci/docker#271 to release Unity 6.3 LTS images to fix our CI