fix type indices not matching in world transfer

src/World.cs

@@ -5,8 +5,8 @@ namespace MoonTools.ECS
 {
 	public class World
 	{
-		internal readonly TypeIndices ComponentTypeIndices = new TypeIndices();
-		internal readonly TypeIndices RelationTypeIndices = new TypeIndices();
+		internal readonly static TypeIndices ComponentTypeIndices = new TypeIndices();
+		internal readonly static TypeIndices RelationTypeIndices = new TypeIndices();
 		internal readonly EntityStorage EntityStorage = new EntityStorage();
 		internal readonly ComponentDepot ComponentDepot;
 		internal readonly MessageDepot MessageDepot = new MessageDepot();
@@ -163,14 +163,14 @@ namespace MoonTools.ECS
 				other.Destroy(entity);
 			}
 
-			// create entities and set their components
+			// create entities
 			foreach (var entity in filter.Entities)
 			{
-				TransferEntity(other, entity);
+				var otherWorldEntity = other.CreateEntity(GetTag(entity));
+				WorldToTransferID.Add(entity.ID, otherWorldEntity.ID);
 			}
 
-			// set relations
-			// FIXME: something is going wrong here, the transfer back isn't working
+			// set relations before components so filters don't freak out
 			foreach (var entity in filter.Entities)
 			{
 				var otherWorldEntityA = WorldToTransferID[entity.ID];
@@ -194,19 +194,17 @@ namespace MoonTools.ECS
 					}
 				}
 			}
-		}
 
-		private unsafe int TransferEntity(World other, Entity entity)
+			// set components
+			foreach (var entity in filter.Entities)
 			{
-			var otherWorldEntity = other.CreateEntity(GetTag(entity));
-			WorldToTransferID.Add(entity.ID, otherWorldEntity.ID);
+				var otherWorldEntity = WorldToTransferID[entity.ID];
 
 				foreach (var componentTypeIndex in EntityStorage.ComponentTypeIndices(entity.ID))
 				{
 					other.Set(otherWorldEntity, componentTypeIndex, ComponentDepot.UntypedGet(entity.ID, componentTypeIndex));
 				}
-
-			return otherWorldEntity.ID;
+			}
 		}
 	}
 }