fix: improve networking warning messages [MTT-1293] (#1855)

* fix: improve networking warning messages

Co-authored-by: Fatih Mar <mfatihmar@gmail.com>

Author: mattwalsh-unity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -36,6 +36,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 - Fixed issue where NetworkManager would continue starting even if the NetworkTransport selected failed. (#1780)
 - Fixed issue when spawning new player if an already existing player exists it does not remove IsPlayer from the previous player (#1779)
 - Fixed lack of notification that NetworkManager and NetworkObject cannot be added to the same GameObject with in-editor notifications (#1777)
+- Fixed parenting warning printing for false positives (#1855)
 
 ## [1.0.0-pre.6] - 2022-03-02
 

com.unity.netcode.gameobjects/Runtime/Core/NetworkManager.cs

@@ -1284,6 +1284,8 @@ private void OnNetworkPostLateUpdate()
                 NetworkMetrics.UpdateNetworkObjectsCount(SpawnManager.SpawnedObjects.Count);
                 NetworkMetrics.UpdateConnectionsCount((IsServer) ? ConnectedClients.Count : 1);
                 NetworkMetrics.DispatchFrame();
+
+                NetworkObject.VerifyParentingStatus();
             }
             SpawnManager.CleanupStaleTriggers();
 

com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs

@@ -658,13 +658,7 @@ internal bool ApplyNetworkParenting()
 
             if (!NetworkManager.SpawnManager.SpawnedObjects.ContainsKey(m_LatestParent.Value))
             {
-                if (OrphanChildren.Add(this))
-                {
-                    if (NetworkLog.CurrentLogLevel <= LogLevel.Normal)
-                    {
-                        NetworkLog.LogWarning($"{nameof(NetworkObject)} ({name}) cannot find its parent, added to {nameof(OrphanChildren)} set");
-                    }
-                }
+                OrphanChildren.Add(this);
                 return false;
             }
 
@@ -757,6 +751,27 @@ internal void MarkVariablesDirty()
             }
         }
 
+        // NGO currently guarantees that the client will receive spawn data for all objects in one network tick.
+        //  Children may arrive before their parents; when they do they are stored in OrphanedChildren and then
+        //  resolved when their parents arrived.  Because we don't send a partial list of spawns (yet), something
+        //  has gone wrong if by the end of an update we still have unresolved orphans
+        //
+
+        // if and when we have different systems for where it is expected that orphans survive across ticks,
+        //   then this warning will remind us that we need to revamp the system because then we can no longer simply
+        //   spawn the orphan without its parent (at least, not when its transform is set to local coords mode)
+        //   - because then you’ll have children popping at the wrong location not having their parent’s global position to root them
+        //   - and then they’ll pop to the correct location after they get the parent, and that would be not good
+        internal static void VerifyParentingStatus()
+        {
+            if (NetworkLog.CurrentLogLevel <= LogLevel.Normal)
+            {
+                if (OrphanChildren.Count > 0)
+                {
+                    NetworkLog.LogWarning($"{nameof(NetworkObject)} ({OrphanChildren.Count}) children not resolved to parents by the end of frame");
+                }
+            }
+        }
         internal void SetNetworkVariableData(FastBufferReader reader)
         {
             for (int i = 0; i < ChildNetworkBehaviours.Count; i++)