patch 9.1.1269: completion: compl_shown_match is updated when starting keyword completion

Problem:  compl_shown_match is updated when starting keyword completion
          and does not include fuzzy matching.
Solution: Do not update compl_shown_match when starting keyword
          completion, since it is the one already selected by the
          keyword completion direction. (glepnir)

closes: #17033

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/insexpand.c b/src/insexpand.c
index 3c81749..de3d519 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -1352,10 +1352,10 @@
     int		compl_no_select = (cur_cot_flags & COT_NOSELECT) != 0;
     int		fuzzy_filter = (cur_cot_flags & COT_FUZZY) != 0;
     int		fuzzy_sort = fuzzy_filter && !(cur_cot_flags & COT_NOSORT);
-
     compl_T	*match_head = NULL;
     compl_T	*match_tail = NULL;
     compl_T	*match_next = NULL;
+    int		update_shown_match = fuzzy_filter;
 
     // Need to build the popup menu list.
     compl_match_arraysize = 0;
@@ -1366,6 +1366,10 @@
     if (match_at_original_text(compl_shown_match))
 	shown_match_ok = TRUE;
 
+    if (fuzzy_filter && ctrl_x_mode_normal() && compl_leader.string == NULL
+	    && compl_shown_match->cp_score > 0)
+	update_shown_match = FALSE;
+
     if (compl_leader.string != NULL
 	    && STRCMP(compl_leader.string, compl_orig_text.string) == 0
 	    && shown_match_ok == FALSE)
@@ -1415,7 +1419,8 @@
 		    shown_compl = compl;
 		// Update the maximum fuzzy score and the shown match
 		// if the current item's score is higher
-		if (fuzzy_sort && compl->cp_score > max_fuzzy_score)
+		if (fuzzy_sort && compl->cp_score > max_fuzzy_score
+			&& update_shown_match)
 		{
 		    did_find_shown_match = TRUE;
 		    max_fuzzy_score = compl->cp_score;