Add isItemValidForSlot

src/main/java/refinedstorage/util/InventoryUtils.java

@@ -174,6 +174,12 @@ public class InventoryUtils
 
 		for (int i = 0; i < inventory.getSizeInventory(); ++i)
 		{
+			// @TODO: This is experimental
+			if (!inventory.isItemValidForSlot(i, stack))
+			{
+				continue;
+			}
+
 			ItemStack slot = inventory.getStackInSlot(i);
 
 			if (slot == null)