Make tab-selected hint visible.
Make tab-selected hint visible.

When the user selects an active hint with Tab (for filtered hints),
adjust its z-index such at it is top of the stack.

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