Budrul Chukrut | LightRocket | Getty Images Chinese internet giant Tencent has increased its stake in ride-hailing firm Didi, sending the shares of the U.S.-listed company up more than 8% on Wednesday. However, shares of Didi were down around 5% in pre-market trade on Thursday. Tencent added about 1.78 million Class A Ordinary shares at the end of last year, according to a regulatory filing published Wednesday. That has brought Tencent's stake in Didi to 7.4% as of Dec. 31, up from 6.8% at the time of the ride-hailing firm's disastrous initial public offering in June. Didi is a politically...