Merge 466cf53d35 into 9c58fec8d4

* Multi Profile

* VM and wpf

* avalonia

* Fix right click not working

* Exclude specific profile types from selection

* Rename

* Add Policy Group support

* Add generate policy group

* Adjust UI

* Add Proxy Chain support

* Fix

* Add fallback support

* Add PolicyGroup include other Group support

* Add group in traffic splitting support

* Avoid duplicate tags

* Refactor

* Adjust chained proxy, actual outbound is at the top

Based on actual network flow instead of data packets

* Add helper function

* Refactor

* Add chain selection control to group outbounds

* Avoid self-reference

* Fix

* Improves Tun2Socks address handling

* Avoids circular dependency in profile groups

Adds cycle detection to prevent infinite loops when evaluating profile groups.

This ensures that profile group configurations don't result in stack overflow errors when groups reference each other, directly or indirectly.

* Fix

* Fix

* Update ProfileGroupItem.cs

* Refactor

* Remove unnecessary checks

---------

Co-authored-by: 2dust <31833384+2dust@users.noreply.github.com>

v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs

@@ -186,27 +186,37 @@ public class ProfileGroupItemManager
         visited.Add(indexId);
         stack.Add(indexId);
 
-        Instance.TryGet(indexId, out var groupItem);
+        try
-
-        if (groupItem == null || groupItem.ChildItems.IsNullOrEmpty())
         {
+            Instance.TryGet(indexId, out var groupItem);
+
+            if (groupItem == null || groupItem.ChildItems.IsNullOrEmpty())
+            {
+                return false;
+            }
+
+            var childIds = Utils.String2List(groupItem.ChildItems)
+                .Where(p => !string.IsNullOrEmpty(p))
+                .ToList();
+            if (childIds == null)
+            {
+                return false;
+            }
+
+            foreach (var child in childIds)
+            {
+                if (HasCycle(child, visited, stack))
+                {
+                    return true;
+                }
+            }
+
             return false;
         }
-
+        finally
-        var childIds = Utils.String2List(groupItem.ChildItems)
-            .Where(p => !string.IsNullOrEmpty(p))
-            .ToList();
-
-        foreach (var child in childIds)
         {
-            if (HasCycle(child, visited, stack))
+            stack.Remove(indexId);
-            {
-                return true;
-            }
         }
-
-        stack.Remove(indexId);
-        return false;
     }
 
     public static async Task<(List<ProfileItem> Items, ProfileGroupItem? Group)> GetChildProfileItems(string? indexId)