ADAM'S RIB (1949).
Curiously, I had never seen anything more than clips from this movie. It's your standard Tracy-Hepburn battle-of-the-sexes scenario with the pair as married lawyers, and it even features Digger Barnes #1 singing the song "Farewell, Amanda" (by Cole Porter) who gets homophobic jokes tossed in his direction.
Tracy, by the way, is in the right at every point. Hepburn is an entitled cow. How little things have changed. Some see this film as a feministic document, while others feel Kate momentarily seeing the error of her viewpoint as an invalidating tip-of-the-hat to the patriarchy.
Judy Holliday plays the wife betrayed, although I thought for a moment she was Dorothy Comingore.
Cukor directs, and Ruth Gordon and Garson Kanin script, so it's a good watch. I remember being disappointed by the 1973 TV series with Gwyneth Paltrow's mother and Garrett Boydston.