Core/Creatures: Implemented CREATURE_STATIC_FLAG_6_ALWAYS_STAND_ON_TOP_OF_TARGET

Port From (https://github.com/TrinityCore/TrinityCore/commit/7a46f81fd134c41eb58ea66205ec9100a1013b3b)

Source/Game/Entities/Creature/Creature.cs

@@ -3066,7 +3066,17 @@ namespace Game.Entities
                 Log.outDebug(LogFilter.Unit, $"Creature::SetCannotReachTarget() called with true. Details: {GetDebugInfo()}");
         }
 
-        void SetDefaultMount(uint? mountCreatureDisplayId)
+        public bool IsIgnoringChaseRange()
+        {
+            return _staticFlags.HasFlag(CreatureStaticFlags6.AlwaysStandOnTopOfTarget);
+        }
+
+        public void SetIgnoreChaseRange(bool ignoreChaseRange)
+        {
+            _staticFlags.ApplyFlag(CreatureStaticFlags6.AlwaysStandOnTopOfTarget, ignoreChaseRange);
+        }
+
+        public void SetDefaultMount(uint? mountCreatureDisplayId)
         {
             if (mountCreatureDisplayId.HasValue && !CliDB.CreatureDisplayInfoStorage.HasRecord(mountCreatureDisplayId.Value))
                 mountCreatureDisplayId = null;

Source/Game/Movement/Generators/ChaseMovementGenerator.cs

@@ -63,12 +63,13 @@ namespace Game.Movement
             if (target == null || !target.IsInWorld)
                 return false;
 
+            Creature cOwner = owner.ToCreature();
+
             // the owner might be unable to move (rooted or casting), or we have lost the target, pause movement
             if (owner.HasUnitState(UnitState.NotMove) || owner.IsMovementPreventedByCasting() || HasLostTarget(owner, target))
             {
                 owner.StopMoving();
                 _lastTargetPosition = null;
-                Creature cOwner = owner.ToCreature();
                 if (cOwner != null)
                     cOwner.SetCannotReachTarget(false);
                 return true;
@@ -82,6 +83,9 @@ namespace Game.Movement
             float maxTarget = _range.HasValue ? _range.Value.MaxTolerance + hitboxSum : SharedConst.ContactDistance + hitboxSum;
             ChaseAngle? angle = mutualChase ? null : _angle;
 
+            if (cOwner != null && cOwner.IsIgnoringChaseRange())
+                    minRange = minTarget = maxRange = maxTarget = 0.0f;
+
             // periodically check if we're already in the expected range...
             _rangeCheckTimer.Update(diff);
             if (_rangeCheckTimer.Passed())
@@ -92,7 +96,6 @@ namespace Game.Movement
                     RemoveFlag(MovementGeneratorFlags.InformEnabled);
                     _path = null;
 
-                    Creature cOwner = owner.ToCreature();
                     if (cOwner != null)
                         cOwner.SetCannotReachTarget(false);
 
@@ -108,7 +111,6 @@ namespace Game.Movement
             {
                 RemoveFlag(MovementGeneratorFlags.InformEnabled);
                 _path = null;
-                Creature cOwner = owner.ToCreature();
                 if (cOwner != null)
                     cOwner.SetCannotReachTarget(false);
                 owner.ClearUnitState(UnitState.ChaseMove);
@@ -123,7 +125,6 @@ namespace Game.Movement
                 _mutualChase = mutualChase;
                 if (owner.HasUnitState(UnitState.ChaseMove) || !PositionOkay(owner, target, minRange, maxRange, angle))
                 {
-                    Creature cOwner = owner.ToCreature();
                     // can we get to the target?
                     if (cOwner != null && !target.IsInAccessiblePlaceFor(cOwner))
                     {

Source/Game/Movement/Generators/FollowMovementGenerator.cs

@@ -87,11 +87,16 @@ namespace Game.Movement
                 return true;
             }
 
+            float range = _range;
+            Creature cOwner = owner.ToCreature();
+            if (cOwner != null && cOwner.IsIgnoringChaseRange())
+                range = 0.0f;
+
             _checkTimer.Update(diff);
             if (_checkTimer.Passed())
             {
                 _checkTimer.Reset(CHECK_INTERVAL);
-                if (HasFlag(MovementGeneratorFlags.InformEnabled) && PositionOkay(owner, target, _range, _angle))
+                if (HasFlag(MovementGeneratorFlags.InformEnabled) && PositionOkay(owner, target, range, _angle))
                 {
                     RemoveFlag(MovementGeneratorFlags.InformEnabled);
                     _path = null;
@@ -113,7 +118,7 @@ namespace Game.Movement
             if (_lastTargetPosition == null || _lastTargetPosition.GetExactDistSq(target.GetPosition()) > 0.0f)
             {
                 _lastTargetPosition = new(target.GetPosition());
-                if (owner.HasUnitState(UnitState.FollowMove) || !PositionOkay(owner, target, _range + FOLLOW_RANGE_TOLERANCE))
+                if (owner.HasUnitState(UnitState.FollowMove) || !PositionOkay(owner, target, range + FOLLOW_RANGE_TOLERANCE))
                 {
                     if (_path == null)
                         _path = new PathGenerator(owner);
@@ -135,7 +140,7 @@ namespace Game.Movement
                             tAngle = _angle.LowerBound();
                     }
 
-                    target.GetNearPoint(owner, out x, out y, out z, _range, target.ToAbsoluteAngle(tAngle));
+                    target.GetNearPoint(owner, out x, out y, out z, range, target.ToAbsoluteAngle(tAngle));
 
                     if (owner.IsHovering())
                         owner.UpdateAllowedPositionZ(x, y, ref z);