Just a few months after arriving in Sydney for a planned two-year stay, university students Maggie Zhang and boyfriend Sunny Gu sat down to make a “pros and cons” list about life in Australia.The list was very quickly unbalanced. On the positive side, staying to complete their Masters in Commerce at the University of Sydney would keep the couple, who had met in Australia, together.Weighing down the other side of the equation was a host of negatives, almost all spurred by the coronavirus…