patch 8.0.0643: when a pattern search is slow Vim becomes unusable commit https://github.com/vim/vim/commit/fbd0b0af6800f6ff89857863d6a07ea03f09ff6c Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 17 18:44:21 2017 +0200 patch 8.0.0643: when a pattern search is slow Vim becomes unusable Problem: When 'hlsearch' is set and matching with the last search pattern is very slow, Vim becomes unusable. Cannot quit search by pressing CTRL-C. Solution: When the search times out set a flag and don't try again. Check for timeout and CTRL-C in NFA loop that adds states.

" tests for 'langmap'

if !has('langmap')
  finish
endif

func Test_langmap()
  new
  set langmap=}l,^x,%v

  call setline(1, ['abc'])
  call feedkeys('gg0}^', 'tx')
  call assert_equal('ac', getline(1))

  " in Replace mode
  " need silent! to avoid a delay when entering Insert mode
  call setline(1, ['abcde'])
  silent! call feedkeys("gg0lR%{z\<Esc>00", 'tx')
  call assert_equal('a%{ze', getline(1))

  " in Select mode
  " need silent! to avoid a delay when entering Insert mode
  call setline(1, ['abcde'])
  silent! call feedkeys("gg0}%}\<C-G>}^\<Esc>00", 'tx')
  call assert_equal('a}^de', getline(1))

  quit!
endfunc