patch 8.0.0672: third item of synconcealed() changes too often commit https://github.com/vim/vim/commit/cc0750dc6e878394ab0fd922b7ea4280918ae406 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 24 22:29:24 2017 +0200 patch 8.0.0672: third item of synconcealed() changes too often Problem: Third item of synconcealed() changes too often. (Dominique Pelle) Solution: Reset the sequence number at the start of each line.

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