patch 8.1.1926: cursorline not redrawn when putting a line above the cursor Commit: https://github.com/vim/vim/commit/c2b97643a82bb9fbd202312dac4aa995f92e9e5b Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 25 14:48:37 2019 +0200 patch 8.1.1926: cursorline not redrawn when putting a line above the cursor Problem: Cursorline not redrawn when putting a line above the cursor. Solution: Redraw when the curor line is below a change. (closes https://github.com/vim/vim/issues/4862)

"Test for benchmarking the RE engine

so small.vim
if !has("reltime") | finish | endif
func! Measure(file, pattern, arg)
	for re in range(3)
	    let sstart=reltime()
	    let cmd=printf("../vim -u NONE -N --cmd ':set re=%d'".
		\ " -c 'call search(\"%s\", \"\", \"\", 10000)' -c ':q!' %s", re, escape(a:pattern, '\\'), empty(a:arg) ? '' : a:arg)
	    call system(cmd. ' '. a:file)
	    $put =printf('file: %s, re: %d, time: %s', a:file, re, reltimestr(reltime(sstart)))
	endfor
endfunc