The primary scene in Hany Abu-Assad’s “Huda’s Salon” unfolds in an unbroken ten-minute take, exhibiting hairdresser Huda (Manal Awad) tending to her lone buyer, a girl named Reem (Maisa Abd Elhadi). The ladies gossip about their lives, about social media, Reem talks about her new husband’s jealousy. The salon could also be a makeshift storefront…