By Alexander Cornwell and Tim Hepher DOHA (Reuters) -Two high-tech Airbus A350 jets sit idle with their windows taped and engines covered in a floodlit hangar in the Gulf, hobbled by an international legal dispute between European industrial giant Airbus and Qatar’s national carrier. From a distance, the planes might seem like any other long-haul jetliners crowding the busy Doha hub. But a rare on-site visit by Reuters journalists showed what appeared to be evidence of damage to the surface of parts of the wings, tail and hull. The two planes, worth around $300 million combined according to an…