patch 8.0.0388: filtering lines changes folds commit https://github.com/vim/vim/commit/1159b168dd94c1a25b4284c6544de385855df6f6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 28 21:53:56 2017 +0100 patch 8.0.0388: filtering lines changes folds Problem: filtering lines through "cat", without changing the line count, changes manual folds. Solution: Change how marks and folds are adjusted. (Matthew Malcomson, from neovim #6194.

" Tests for the Tcl interface.

if !has('tcl')
  finish
end

function Test_tcldo()
  " Check deleting lines does not trigger ml_get error.
  new
  call setline(1, ['one', 'two', 'three'])
  tcldo ::vim::command %d_
  bwipe!

  " Check switching to another buffer does not trigger ml_get error.
  new
  let wincount = winnr('$')
  call setline(1, ['one', 'two', 'three'])
  tcldo ::vim::command new
  call assert_equal(wincount + 1, winnr('$'))
  bwipe!
  bwipe!
endfunc