Jenny Yin opened Dumpling Haus in Hilldale Shopping Center in 2011, near the cinema then called Sundance 608. The casual noodle bar became a favorite stop during the Wisconsin Film Festival, and it was a short film — Domee Shi’s “Bao,” a computer-animated Pixar short nominated for a 2019 Oscar — that led us back recently, to see how the restaurant has grown since moving to a larger space in 2016.