Nine days into the 1968 Cannes Film Festival, Jean-Luc Godard and a band of New Wave insurgents brought the Croisette to a halt, shuttering the world’s most glamorous movie showcase in solidarity with student protests sweeping France. Nearly six decades on, the question hanging over this year’s edition is whether geopolitics — from Gaza to Iran — could again hijack the narrative, or whether Cannes will once more prove it can absorb the shock without losing control. This year’s Berlin Film Festival provides a cautionary tale. Fierce debate over the war in Gaza ignited a political firestorm that nearly cost festival director Tricia Tuttle her job. Jury president Wim Wenders’ insistence that “we have to stay out of politics ” was swiftly overtaken by filmmakers who refused to do any such thing.…