Ensure window has focus in tests.
Ensure window has focus in tests.

gdh1995/vimium,mrmr1993/vimium,poacher2k/vimium,willsALMANJ/vimium,decaffeinate-examples/vimium,smblott-github/vimium,gdh1995/vimium,willsALMANJ/vimium,smblott-github/vimium,philc/vimium,philc/vimium,decaffeinate-examples/vimium,gdh1995/vimium,smblott-github/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,poacher2k/vimium,poacher2k/vimium,willsALMANJ/vimium,mrmr1993/vimium,philc/vimium