Core/PacketIO: Implemented CMSG_MOVE_INIT_ACTIVE_MOVER_COMPLETE and ActivePlayerData::TransportServerTime updatefield

Port From (https://github.com/TrinityCore/TrinityCore/commit/aa592e431b945800928f2e43b3812cfa240fada1)

Source/Game/Entities/Object/WorldObject.cs

@@ -1232,7 +1232,7 @@ namespace Game.Entities
             return true;
         }
 
-        bool CanNeverSee(WorldObject obj)
+        public virtual bool CanNeverSee(WorldObject obj)
         {
             return GetMap() != obj.GetMap() || !IsInPhase(obj);
         }

Source/Game/Entities/Player/Player.cs

@@ -780,6 +780,9 @@ namespace Game.Entities
                     GetName(), viewpoint.GetEntry(), viewpoint.GetTypeId());
                 SetViewpoint(viewpoint, false);
             }
+
+            RemovePlayerLocalFlag(PlayerLocalFlags.OverrideTransportServerTime);
+            SetTransportServerTime(0);
         }
 
         void ScheduleDelayedOperation(PlayerDelayedOperations operation)
@@ -4099,6 +4102,13 @@ namespace Game.Entities
             return false;
         }
 
+        public override bool CanNeverSee(WorldObject obj)
+        {
+            // the intent is to delay sending visible objects until client is ready for them
+            // some gameobjects dont function correctly if they are sent before TransportServerTime is correctly set (after CMSG_MOVE_INIT_ACTIVE_MOVER_COMPLETE)
+            return !HasPlayerLocalFlag(PlayerLocalFlags.OverrideTransportServerTime);
+        }
+
         public override bool CanAlwaysSee(WorldObject obj)
         {
             // Always can see self
@@ -7739,6 +7749,8 @@ namespace Game.Entities
         public void AddAuraVision(PlayerFieldByte2Flags flags) { SetUpdateFieldFlagValue(m_values.ModifyValue(m_activePlayerData).ModifyValue(m_activePlayerData.AuraVision), (byte)flags); }
         public void RemoveAuraVision(PlayerFieldByte2Flags flags) { RemoveUpdateFieldFlagValue(m_values.ModifyValue(m_activePlayerData).ModifyValue(m_activePlayerData.AuraVision), (byte)flags); }
 
+        public void SetTransportServerTime(int transportServerTime) { SetUpdateFieldFlagValue(m_values.ModifyValue(m_activePlayerData).ModifyValue(m_activePlayerData.TransportServerTime), transportServerTime); }
+
         public bool CanTameExoticPets() { return IsGameMaster() || HasAuraType(AuraType.AllowTamePetType); }
 
         void SendAttackSwingCantAttack() { SendPacket(new AttackSwingError(AttackSwingErr.CantAttack)); }

Source/Game/Handlers/MovementHandler.cs

@@ -828,5 +828,14 @@ namespace Game
                 _timeSyncClockDelta = back.Item1;
             }
         }
+
+        [WorldPacketHandler(ClientOpcodes.MoveInitActiveMoverComplete, Processing = PacketProcessing.ThreadSafe)]
+        void HandleMoveInitActiveMoverComplete(MoveInitActiveMoverComplete moveInitActiveMoverComplete)
+        {
+            _player.SetPlayerLocalFlag(PlayerLocalFlags.OverrideTransportServerTime);
+            _player.SetTransportServerTime((int)(GameTime.GetGameTimeMS() - moveInitActiveMoverComplete.Ticks));
+
+            _player.UpdateObjectVisibility(false);
+        }
     }
 }

Source/Game/Networking/Packets/MovementPackets.cs

@@ -490,7 +490,7 @@ namespace Game.Networking.Packets
         public ObjectGuid Guid;
         public float SplineDist;
     }
-    
+
     public class MoveSplineSetSpeed : ServerPacket
     {
         public MoveSplineSetSpeed(ServerOpcodes opcode) : base(opcode, ConnectionType.Instance) { }
@@ -1028,7 +1028,7 @@ namespace Game.Networking.Packets
         public ObjectGuid MoverGUID;
         public uint TimeSkipped;
     }
-    
+
     class SummonResponse : ClientPacket
     {
         public SummonResponse(WorldPacket packet) : base(packet) { }
@@ -1239,6 +1239,18 @@ namespace Game.Networking.Packets
         }
     }
 
+    class MoveInitActiveMoverComplete : ClientPacket
+    {
+        public uint Ticks;
+
+        public MoveInitActiveMoverComplete(WorldPacket packet) : base(packet) { }
+
+        public override void Read()
+        {
+            _worldPacket.WriteUInt32(Ticks);
+        }
+    }
+    
     //Structs
     public struct MovementAck
     {