Welcome back to Cannes Check, In Contention's annual preview of the films in Competition at next month's Cannes Film Festival, which kicks off on May 14. Taking on different selections every day, we'll be examining what they're about, who's involved and what their chances are of snagging an award from Jane Campion's jury. Next up: the second of four French entries: Bertrand Bonello's "Saint Laurent."  The director: Bertrand Bonello (French, 45 years old). Born in Nice and now based in Paris and Montreal, Bonello began his career as a classical musician -- a background that makes sense, given the stately refinement and sensory elevation of his filmmaking. (He still serves as his own composer.) Which is not to say his work is soft, testing as it does formal and erotic boundaries: scholars of contemporary French cinema tend to group him with the likes of Gaspar Noé in the bracket of New French Extremism.