Core/Transports: Fixed stoppable elevator position calculation when going from first floor to third or higher

Port From (https://github.com/TrinityCore/TrinityCore/commit/d85379faa6d5d33f755e17cb0204f243345db938)

Source/Framework/Constants/SharedConst.cs

@@ -305,7 +305,6 @@ namespace Framework.Constants
             29, 30, 31, -1, 11, 12, 13, 14
         };
 
-
         public static ulong RaceMaskAllPlayable = (ulong)(GetMaskForRace(Race.Human) | GetMaskForRace(Race.Orc) | GetMaskForRace(Race.Dwarf) | GetMaskForRace(Race.NightElf) | GetMaskForRace(Race.Undead)
             | GetMaskForRace(Race.Tauren) | GetMaskForRace(Race.Gnome) | GetMaskForRace(Race.Troll) | GetMaskForRace(Race.BloodElf) | GetMaskForRace(Race.Draenei)
             | GetMaskForRace(Race.Goblin) | GetMaskForRace(Race.Worgen) | GetMaskForRace(Race.PandarenNeutral) | GetMaskForRace(Race.PandarenAlliance) | GetMaskForRace(Race.PandarenHorde)

Source/Game/Entities/GameObject/GameObject.cs

@@ -3823,7 +3823,12 @@ namespace Game.Entities
                 if (oldToNewStateDelta < 0)
                     oldToNewStateDelta += pauseTimesCount + 1;
 
-                if (oldToNewStateDelta < newToOldStateDelta)
+                // this additional check is neccessary because client doesn't check dynamic flags on progress update
+                // instead it multiplies progress from dynamicflags field by -1 and then compares that against 0
+                // when calculating path progress while we simply check the flag if (!_owner.HasDynamicFlag(GO_DYNFLAG_LO_INVERTED_MOVEMENT))
+                bool isAtStartOfPath = _stateChangeProgress == 0;
+
+                if (oldToNewStateDelta < newToOldStateDelta && !isAtStartOfPath)
                     _owner.SetDynamicFlag(GameObjectDynamicLowFlags.InvertedMovement);
                 else
                     _owner.RemoveDynamicFlag(GameObjectDynamicLowFlags.InvertedMovement);