patch 8.2.3940: match highlight disappears when doing incsearch for ":s/pat"

Problem:    Match highlight disappears when doing incsearch for ":s/pat".
Solution:   Only use line limit for incsearch highlighting. (closes #9425)
diff --git a/src/version.c b/src/version.c
index 0f0414e..ee3a29f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3940,
+/**/
     3939,
 /**/
     3938,