Use the statusline to view one more line.
:set statusline=%{horizon#broaden()}
to use the statusline to view the coming next line!
Plug 'sunnypp/vim-horizon'
cd ~/.vim/bundle
git clone git://github.com/sunnypp/vim-horizon.git
With the help of repeat(' ', &tabstop)
By repeat(' ', &numberwidth * &number)
So feel free to just add %{horizon#broaden()}
to, like, vim-airline.