patch 8.1.0698: clearing the window is used too often commit https://github.com/vim/vim/commit/bf3250a8ad39797e3ccdac82d20c6f19533419e4 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 6 17:25:29 2019 +0100 patch 8.1.0698: clearing the window is used too often Problem: Clearing the window is used too often, causing the command line to be cleared when opening a tab. (Miroslav Ko?k?r) Solution: Use NOT_VALID instead of CLEAR. (suggested by Jason Franklin, closes #630) Also do this for a few other places where clearing the screen isn't really needed.

" Test if fnameescape is correct for special chars like !
function! Test_fnameescape()
  let fname = 'Xspa ce'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "Space")
  call delete(fname)

  let fname = 'Xemark!'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "ExclamationMark")
  call delete(fname)
endfunction