Core/Movement: Creatures' idle movement generator can no longer override player mover control.

Port From (https://github.com/TrinityCore/TrinityCore/commit/88c1739e3e1ecf58407b0846f3c8dfeb589f3113)

Source/Game/AI/AISelector.cs

@@ -99,10 +99,15 @@ namespace Game.AI
 
         public static IMovementGenerator SelectMovementAI(Creature creature)
         {
-            return creature.DefaultMovementType switch
+            MovementGeneratorType type = MovementGeneratorType.Idle;
+            if (creature.GetPlayerMovingMe() == null)
+                type = creature.GetDefaultMovementType();
+
+            return type switch
             {
                 MovementGeneratorType.Random => new RandomMovementGenerator(),
                 MovementGeneratorType.Waypoint => new WaypointMovementGenerator(),
+                MovementGeneratorType.Idle => new IdleMovementGenerator(),
                 _ => null,
             };
         }

Source/Game/Entities/Creature/Creature.cs

@@ -3177,7 +3177,7 @@ namespace Game.Entities
         public void SetNoSearchAssistance(bool val) { m_AlreadySearchedAssistance = val; }
         public bool HasSearchedAssistance() { return m_AlreadySearchedAssistance; }
 
-        MovementGeneratorType GetDefaultMovementType() { return DefaultMovementType; }
+        public MovementGeneratorType GetDefaultMovementType() { return DefaultMovementType; }
         public void SetDefaultMovementType(MovementGeneratorType mgt) { DefaultMovementType = mgt; }
 
         public long GetRespawnTime() { return m_respawnTime; }

Source/Game/Entities/Player/Player.cs

@@ -7245,8 +7245,13 @@ namespace Game.Entities
         public void SetMover(Unit target)
         {
             m_unitMovedByMe.m_playerMovingMe = null;
+            if (m_unitMovedByMe.IsCreature())
+                m_unitMovedByMe.GetMotionMaster().Initialize();
+
             m_unitMovedByMe = target;
             m_unitMovedByMe.m_playerMovingMe = this;
+            if (m_unitMovedByMe.IsCreature())
+                m_unitMovedByMe.GetMotionMaster().Initialize();
 
             MoveSetActiveMover packet = new();
             packet.MoverGUID = target.GetGUID();

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -1603,7 +1603,7 @@ namespace Game.Entities
             return null;
         }
 
-        Player GetPlayerMovingMe() { return m_playerMovingMe; }
+        public Player GetPlayerMovingMe() { return m_playerMovingMe; }
 
         public void AddUnitMovementFlag(MovementFlag f)
         {