positive reviews for “A Hero,” saying Farhadi’s latest is “shot with precision, written with elegance and unfolding at a thriller-like pace.”Farhadi had conceded that the film is based on the same true story as “All Winners and Losers,” a documentary developed by Azadeh Masihzadeh while she was a student of Farhadi’s. But Farhadi didn’t credit her, and claimed he had been researching the tale independently.When called out by his student, Farhadi sued Masihzadeh for defamation; she then countersued Farhadi, claiming he had plagiarized her original work.