patch 8.0.0396: 'balloonexpr' only works synchronously commit https://github.com/vim/vim/commit/59716a27bd5c6c64def6c3ca430ff1246deae749 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 1 20:32:44 2017 +0100 patch 8.0.0396: 'balloonexpr' only works synchronously Problem: 'balloonexpr' only works synchronously. Solution: Add balloon_show(). (Jusufadis Bakamovic, closes https://github.com/vim/vim/issues/1449)

" Test for joining lines.

func Test_join_with_count()
  new
  call setline(1, ['one', 'two', 'three', 'four'])
  normal J
  call assert_equal('one two', getline(1))
  %del
  call setline(1, ['one', 'two', 'three', 'four'])
  normal 10J
  call assert_equal('one two three four', getline(1))
  quit!
endfunc