patch 8.2.3394: filler lines are wrong when changing text in diff mode

Problem:    Filler lines are wrong when changing text in diff mode.
Solution:   Don't change the filler lines on every change.  Check
            scrollbinding when updating the filler lines. (closes #8809)
diff --git a/src/version.c b/src/version.c
index 3a16dda..8811ee1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3394,
+/**/
     3393,
 /**/
     3392,