commit https://github.com/vim/vim/commit/44a2f923c00f1384c9ecde12fb5b4711bc20702e Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 19 22:11:51 2016 +0100 patch 7.4.1611 Problem: The versplit feature makes the code uneccessary complicated. Solution: Remove FEAT_VERTSPLIT, always support vertical splits when FEAT_WINDOWS is defined.

" Test feedkeys() function.

func Test_feedkeys_x_with_empty_string()
  new
  call feedkeys("ifoo\<Esc>")
  call assert_equal('', getline('.'))
  call feedkeys('', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc