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.
diff --git a/src/edit.c b/src/edit.c
index 89a5fae..da1b238 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -4512,7 +4512,7 @@
found_new_match = searchit(NULL, ins_buf, pos,
compl_direction,
compl_pattern, 1L, SEARCH_KEEP + SEARCH_NFMSG,
- RE_LAST, (linenr_T)0, NULL);
+ RE_LAST, (linenr_T)0, NULL, NULL);
--msg_silent;
if (!compl_started || set_match_pos)
{