patch 8.1.1795: no syntax HL after splitting windows with :bufdo commit https://github.com/vim/vim/commit/c7f1e4002184903f4e12e429dd5c6ab731932f86 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Aug 3 13:29:46 2019 +0200 patch 8.1.1795: no syntax HL after splitting windows with :bufdo Problem: No syntax HL after splitting windows with :bufdo. (Yasuhiro Matsumoto) Solution: Trigger Syntax autocommands in buffers that are active. (closes #4761)

"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