Vienna's famed coffeehouses, while embracing the Eurovision Song Contest, have also become a microcosm of the tensions surrounding Israel’s inclusion in the sequin-drenched pop music competition. Initially, Israel was conspicuously absent from the list of "Eurofan Cafes" – Vienna coffee shops offering food and music from competing countries. MQ Kantine, a modern café in the city’s arty museums quarter, stepped in. It now features falafel, bagels with lox, and kosher wine, with small Israeli flags hanging from the ceiling – and a police officer outside its door. Security is notably tight across Vienna during the international music contest, whose "United by Music" slogan rings somewhat hollow this year. Five countries are boycotting due to Israel’s participation. Pro-Palestinian activists plan a protest concert – one of several Eurovision alternatives across Europe – and an anti-Israel march before Saturday’s grand final. At MQ Kantine, volunteers monitor for potential trouble.…