Junegunn Choi 242c0db26b [vim] Fix height calculation ...

Fix #1418

e.g.
  call fzf#run({'source': [1, 2, 3], 'down': '~50%', 'options': "--border --header $'1\n2'"})

2020-03-03 23:50:45 +09:00

..

fzf.vim

[vim] Fix height calculation

2020-03-03 23:50:45 +09:00