auto update NPC slot location and reload on mesh change for buildings

src/engine/objects/Building.java

@@ -12,6 +12,7 @@ package engine.objects;
 import engine.Enum;
 import engine.Enum.*;
 import engine.InterestManagement.HeightMap;
+import engine.InterestManagement.InterestManager;
 import engine.InterestManagement.RealmMap;
 import engine.InterestManagement.WorldGrid;
 import engine.db.archive.CityRecord;
@@ -394,7 +395,7 @@ public class Building extends AbstractWorldObject {
         this.rank = newRank;
 
         // New rank means new mesh
-
+        int oldMeshID = this.meshUUID;
         newMeshUUID = this.getBlueprint().getMeshForRank(this.rank);
         this.meshUUID = newMeshUUID;
 
@@ -428,6 +429,15 @@ public class Building extends AbstractWorldObject {
         BuildingManager.cleanupHirelings(this);
 
         this.isDeranking.compareAndSet(true, false);
+
+        if(oldMeshID != this.meshUUID) {
+            //move NPCs to new slot locations if the mesh was changed and force reload them
+            int index = 0;
+            for (AbstractCharacter hireling : this.hirelings.keySet()) {
+                hireling.setLoc(BuildingManager._slotLocations.get(newMeshUUID).get(index).getLocation());
+                InterestManager.reloadCharacter(hireling);
+            }
+        }
     }
 
     public final int getOwnerUUID() {