patch 8.0.0885: terminal window scrollback is stored inefficiently commit https://github.com/vim/vim/commit/33a43bee9cdc62f9cd0999eb23c6eca01b4d2d67 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 6 21:36:22 2017 +0200 patch 8.0.0885: terminal window scrollback is stored inefficiently Problem: Terminal window scrollback is stored inefficiently. Solution: Store the text in the Vim buffer.

" 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