China's state news agency has had to issue a correction after it referred to President Xi Jinping as "China's last leader", an apparent copyediting error. Xinhua later amended the copy, which had by then been widely reused, and asked outlets to change the reference to "China's top leader". In the end many outlets simply removed Sunday's article in its entirety. Such a mishap is extremely rare as references to China's president are believed to be closely scrutinised. Chinese media is heavily regulated, with government censors often removing content on websites and social media. The two phrases are just one character...