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.

" Tests for the preview window

func Test_Psearch()
  " this used to cause ml_get errors
  help
  let wincount = winnr('$')
  0f
  ps.
  call assert_equal(wincount + 1, winnr('$'))
  pclose
  call assert_equal(wincount, winnr('$'))
  bwipe
endfunc