If you came into I’m Still Here a few seconds late, or simply looked away from the screen during the title that identifies the time and place of its opening scenes, you’d have no idea you were looking at life under a military dictatorship. Eunice Paiva (Fernanda Torres) floats in the ocean off the coast of Rio de Janeiro, 1970, while her children play on the beach nearby, hatching a scheme to sneak a stray dog into the house under the nose of their father, Rubens (Selton Mello). It’s been six years since the army seized power, and yet life,...