fix blocking mode somehow voiding items

src/main/java/appeng/util/inv/AdaptorItemHandler.java

@@ -232,6 +232,10 @@ public class AdaptorItemHandler extends InventoryAdaptor
 
 		for( int slot = 0; slot < this.itemHandler.getSlots(); slot++ )
 		{
+			if( !simulate )
+			{
+				itemsToAdd = itemsToAdd.copy();
+			}
 			itemsToAdd = this.itemHandler.insertItem( slot, itemsToAdd, simulate );
 
 			if( itemsToAdd.isEmpty() )

src/main/java/appeng/util/inv/AdaptorItemRepository.java

@@ -163,23 +163,26 @@ public class AdaptorItemRepository extends InventoryAdaptor
 		return this.addItems( toBeAdded, false );
 	}
 
-	protected ItemStack addItems( final ItemStack itemsToAdd, final boolean simulate )
+	protected ItemStack addItems( ItemStack itemsToAdd, final boolean simulate )
 	{
 		if( itemsToAdd.isEmpty() )
 		{
 			return ItemStack.EMPTY;
 		}
 
-		ItemStack left = itemsToAdd.copy();
+		if( !simulate )
+		{
+			itemsToAdd = itemsToAdd.copy();
+		}
 
-		left = this.itemRepository.insertItem( left, simulate );
+		itemsToAdd = this.itemRepository.insertItem( itemsToAdd, simulate );
 
-		if( left.isEmpty() )
+		if( itemsToAdd.isEmpty() )
 		{
 			return ItemStack.EMPTY;
 		}
 
-		return left;
+		return itemsToAdd;
 	}
 
 	@Override

src/main/java/appeng/util/inv/BlockingItemHandler.java

@@ -37,11 +37,10 @@ public class BlockingItemHandler extends BlockingInventoryAdaptor
 		for( int slot = 0; slot < slots; slot++ )
 		{
 			ItemStack is = this.itemHandler.getStackInSlot( slot );
-			if( is.isEmpty() || !isBlockableItem( is ) )
+			if( !is.isEmpty() && isBlockableItem( is ) )
 			{
-				continue;
+				return true;
 			}
-			return true;
 		}
 		return false;
 	}