China and India are having a bit of a moment. Five years after a fatal confrontation on their unresolved border pushed relations over the edge, the two sides are rushing towards a detente. They are restoring peace along the border, reversing trade and investment curbs, easing visa restrictions to promote business and tourism, resuming direct flights and orchestrating a flurry of high-level official visits to formalise the thaw.This weekend, Indian Prime Minister Narendra Modi is visiting China...