Ever since his epic 19-second-long handshake with a visibly bewildered Shinzo Abe of Japan, Donald Trump’s unusual handshake style has been under the microscope. The strange, jerky movement he deploys to dominate his counterparts has become something of a talking point. But the Canadian prime minister, Justin Trudeau, the latest world leader to meet the US president, has managed to neutralise the Trumpshake with a clever combination of timing, balance and control