Bug Fix: Fix MyCard watch avatar refresh on recycled UI rows

Prevents MissingReferenceException spam when MyCard watch-list items are destroyed or recycled during async avatar loading. Avatar downloads now respect row lifetime/cancellation and only update RawImage targets that still exist.

Assets/Scripts/MDPro3/Game/Tools.cs

@@ -7,6 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Net;
 using System.Text.RegularExpressions;
+using System.Threading;
 using System.Threading.Tasks;
 using UnityEngine;
 using UnityEngine.Networking;
@@ -224,16 +225,19 @@ namespace MDPro3
 
         #region Online
 
-        public static async Task<Texture2D> DownloadImageAsync(string url)
+        public static async Task<Texture2D> DownloadImageAsync(string url, CancellationToken cancellationToken = default)
         {
             using var request = UnityWebRequestTexture.GetTexture(url);
             request.SetRequestHeader("User-Agent", "MDPro3/" + Application.version + " (" + System.Environment.OSVersion.ToString() + "); Unity/" + Application.unityVersion);
 
             var send = request.SendWebRequest();
-            await TaskUtility.WaitUntil(() => send.isDone);
+            while (!send.isDone)
+                await TaskUtility.WaitOneFrame(cancellationToken);
             if (!Application.isPlaying)
                 return null;
 
+            cancellationToken.ThrowIfCancellationRequested();
+
             if (request.result == UnityWebRequest.Result.Success)
             {
                 return DownloadHandlerTexture.GetContent(request);

Assets/Scripts/MDPro3/Net/MyCard.cs

 using System;
+using System.Threading;
 using System.Threading.Tasks;
 using UnityEngine;
 using UnityEngine.Networking;
@@ -113,8 +114,10 @@ namespace MDPro3.Net
             }
         }
 
-        public static async UniTask<Texture2D> GetAvatarAsync(string userName)
+        public static async UniTask<Texture2D> GetAvatarAsync(string userName, CancellationToken cancellationToken = default)
         {
+            cancellationToken.ThrowIfCancellationRequested();
+
             if(!Directory.Exists(avatarSavePath))
                 Directory.CreateDirectory(avatarSavePath);
 
@@ -137,6 +140,7 @@ namespace MDPro3.Net
                         return cachedAvatars[avatarName];
 
                 var pic = await TextureManager.LoadPicFromFileAsync(fullPath);
+                cancellationToken.ThrowIfCancellationRequested();
 
                 lock (cachedAvatars)
                     if (!cachedAvatars.ContainsKey(avatarName))
@@ -148,7 +152,7 @@ namespace MDPro3.Net
 
             using(var request = UnityWebRequest.Get(userUrl.Replace("{username}", userName)))
             {
-                await request.SendWebRequest();
+                await request.SendWebRequest().WithCancellation(cancellationToken);
                 if (request.result == UnityWebRequest.Result.Success)
                 {
                     avatarAddress = JsonUtility.FromJson<MyCardRoomUserInfo>(request.downloadHandler.text).user.avatar;
@@ -160,8 +164,11 @@ namespace MDPro3.Net
                 }
             }
 
-            var requestAvatar = Tools.DownloadImageAsync(avatarAddress);
+            cancellationToken.ThrowIfCancellationRequested();
+
+            var requestAvatar = Tools.DownloadImageAsync(avatarAddress, cancellationToken);
             await requestAvatar;
+            cancellationToken.ThrowIfCancellationRequested();
             Texture2D downloadImage = requestAvatar.Result;
             if (downloadImage == null)
                 return null;

Assets/Scripts/MDPro3/UI/SelectionButton/SelectionToggle_Watch.cs

@@ -2,9 +2,11 @@ using MDPro3.Net;
 using TMPro;
 using UnityEngine;
 using UnityEngine.UI;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Text;
+using System.Threading;
 using UnityEngine.EventSystems;
 using MDPro3.Servant;
 using MDPro3.UI.ServantUI;
@@ -62,14 +64,33 @@ namespace MDPro3.UI
         protected override async UniTask RefreshAsync()
         {
             refreshed = false;
+            var cancellationToken = cts?.Token ?? destroyCancellationToken;
+            var face0 = Manager.GetElement<RawImage>("Face0");
+            var face1 = Manager.GetElement<RawImage>("Face1");
 
-            Manager.GetElement<RawImage>("Face0").texture = Appearance.defaultFace0.texture;
-            Manager.GetElement<RawImage>("Face1").texture = Appearance.defaultFace1.texture;
+            if (face0 != null)
+                face0.texture = Appearance.defaultFace0.texture;
+            if (face1 != null)
+                face1.texture = Appearance.defaultFace1.texture;
 
-            Manager.GetElement<RawImage>("Face0").texture = await MyCard.GetAvatarAsync(player0Name);
-            Manager.GetElement<RawImage>("Face1").texture = await MyCard.GetAvatarAsync(player1Name);
+            try
+            {
+                var avatar0 = await MyCard.GetAvatarAsync(player0Name, cancellationToken);
+                if (!cancellationToken.IsCancellationRequested && face0 != null)
+                    face0.texture = avatar0;
+
+                var avatar1 = await MyCard.GetAvatarAsync(player1Name, cancellationToken);
+                if (!cancellationToken.IsCancellationRequested && face1 != null)
+                    face1.texture = avatar1;
 
-            refreshed = true;
+                refreshed = true;
+            }
+            catch (OperationCanceledException)
+            {
+            }
+            catch (MissingReferenceException)
+            {
+            }
         }
 
         protected override void CallToggleOnEvent()