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In Chemnitz, Sabine Hartmannshenn and her “Siegfried” belonged to the women’s director’s quartet of Wagner’s “Ring”. Now she has staged an operetta by Johann Strauss in Dresden that doesn’t actually exist: among the 15 works by the Viennese king of waltzes and operettas, one looks in vain for the title “Casanova”. But in 1928 Ralph Benatzky, who…