SHANGHAI/HONG KONG (Reuters) -Hong Kong-listed shares of Chinese electric vehicle (EV) makers fell on Thursday after the European Commission launched an investigation into Chinese EV subsidies, escalating EU-China tensions and prompting analysts to warn of retaliatory action. European Commission President Ursula von der Leyen announced the investigation on Wednesday, accusing China of flooding global markets with electric cars that had artificially low prices because of huge state subsidies. Eurasia Group analysts said the probe underscored growing protectionist tendencies in Europe and they...