patch 9.0.0512: cannot redraw the status lines when editing a command

Problem:    Cannot redraw the status lines when editing a command.
Solution:   Only postpone the redraw when messages have scrolled.
            (closes #11170)
diff --git a/src/version.c b/src/version.c
index c6f76ac..55da620 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    512,
+/**/
     511,
 /**/
     510,