Investors are impressed with the housing parts maker's resilience.Shares of Quanex Building Products (NX +8.55%) popped on Friday after the manufacturer of window, door, and cabinet components delivered larger-than-expected profits in its fiscal fourth quarter. As of 1:57 p.m. EST, Quanex's stock price was up more than 10%. Quanex produced robust cash flow in a difficult economic environmentQuanex's sales declined less than 1% year over year to $489.8 million in the quarter ended Oct. 31."Inflationary press ...