patch 8.1.1123: no way to avoid filtering for autocomplete function commit https://github.com/vim/vim/commit/73655cf0ca37a9aa8f56fc51bb853a8b1f7b43d4 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Apr 6 13:45:55 2019 +0200 patch 8.1.1123: no way to avoid filtering for autocomplete function Problem: No way to avoid filtering for autocomplete function, causing flickering of the popup menu. Solution: Add the "equal" field to complete items. (closes #3887)

func Test_empty_buffer()
  new
  insert
a
b
c
d
.
  call assert_equal(1, line("''"))
  bwipe!
endfunc