With queer travelers gearing up to carefully jet off on global holidays again in the coming months, we scoured the world’s top museums to find the best springtime exhibitions by and about LGBTQ artists. Many long-anticipated shows that had been postponed by the pandemic are now on full display, spanning the spectrum from emerging artists’ big-museum debuts to major retrospectives of revered art icons. From Austria to Australia, London to Los Angeles and Brazilian art in Berlin, these are our picks for the 13 shows not to miss this spring. Royal Academy of Arts, London “Head VI,” 1949Francis Bacon / The Estate of Francis Bacon The son of a horse-breeder…