patch 8.0.1389: getqflist() items are missing if not set commit https://github.com/vim/vim/commit/a6d4849c711379b773529afaed640455287ac934 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Dec 12 22:45:31 2017 +0100 patch 8.0.1389: getqflist() items are missing if not set Problem: getqflist() items are missing if not set, that makes it more difficult to handle the values. Solution: When a value is not available return zero or another invalid value. (Yegappan Lakshmanan, closes #2430)

" Tests for the preview window

func Test_Psearch()
  " this used to cause ml_get errors
  help
  let wincount = winnr('$')
  0f
  ps.
  call assert_equal(wincount + 1, winnr('$'))
  pclose
  call assert_equal(wincount, winnr('$'))
  bwipe
endfunc