patch 8.1.0654: when deleting a line text property flags are not adjusted commit https://github.com/vim/vim/commit/c1a9bc1a7284bd0e60f9bddfef6a4ee733bfc838 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 28 21:59:29 2018 +0100 patch 8.1.0654: when deleting a line text property flags are not adjusted Problem: When deleting a line text property flags are not adjusted. Solution: Adjust text property flags in preceding and following lines.

function Test_Comparators()
  try
    let oldisident=&isident
    set isident+=#
    call assert_equal(1, 1 is#1)
  finally
    let &isident=oldisident
  endtry
endfunction