Analysts say the war in Iran has delivered some big strategic wins to China ahead of Donald Trump's trip to Beijing.But China's President Xi Jinping also has strong incentives to work with his American counterpart to secure the Strait of Hormuz.Mr Trump has left Washington for the first visit to China by a US president since 2017, when he was previously in office.The summit was originally expected to focus on trade and economic ties. But it was delayed by the war in Iran, which is now overshadowing other issues.Iran war live updates: For the latest news on the Middle East…