vim-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.
https://github.com/vim/vim/commit/fbd0b0af6800f6ff89857863d6a07ea03f09ff6c

1 files changed, 3 insertions, 2 deletions

diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index f0c37c0e38..ee1cf2182f 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -2128,8 +2128,9 @@ win_found:
       save_cursor = curwin->w_cursor;
       curwin->w_cursor.lnum = 0;
       if (!do_search(NULL, '/', qf_ptr->qf_pattern, (long)1,
-              SEARCH_KEEP, NULL))
+                     SEARCH_KEEP, NULL, NULL)) {
         curwin->w_cursor = save_cursor;
+      }
     }
 
     if ((fdo_flags & FDO_QUICKFIX) && old_KeyTyped)
@@ -3758,7 +3759,7 @@ void ex_vimgrep(exarg_T *eap)
            ++lnum) {
         col = 0;
         while (vim_regexec_multi(&regmatch, curwin, buf, lnum,
-                                 col, NULL) > 0) {
+                                 col, NULL, NULL) > 0) {
           // Pass the buffer number so that it gets used even for a
           // dummy buffer, unless duplicate_name is set, then the
           // buffer will be wiped out below.