BEIJING — A high-ranking editor at a Chinese Communist Party newspaper who often wrote liberal-leaning commentaries is expected to stand trial for espionage in Beijing, after he was arrested while eating lunch with a Japanese diplomat. The editor, Dong Yuyu, was a columnist and deputy editor of the editorial section at Guangming Daily, one of the party’s major newspapers. For decades, he had routinely met with foreigners, including diplomats and journalists, in part to inform his own prolific writing. But now the authorities are eyeing those interactions as proof that…