PreCheck

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.

v2rayN/Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
 
     <PropertyGroup>
-        <Version>7.15.1</Version>
+        <Version>7.15.0</Version>
     </PropertyGroup>
 
     <PropertyGroup>

v2rayN/ServiceLib/Manager/ProfileGroupItemManager.cs

@@ -186,37 +186,27 @@ public class ProfileGroupItemManager
         visited.Add(indexId);
         stack.Add(indexId);
 
-        try
+        Instance.TryGet(indexId, out var groupItem);
+
+        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)
         {
-            stack.Remove(indexId);
+            if (HasCycle(child, visited, stack))
+            {
+                return true;
+            }
         }
+
+        stack.Remove(indexId);
+        return false;
     }
 
     public static async Task<(List<ProfileItem> Items, ProfileGroupItem? Group)> GetChildProfileItems(string? indexId)