patch 8.2.3556: filler lines are incorrect for other window in diff mode

Problem:    Filler lines are incorrect for other window in diff mode after
            making a change.
Solution:   Copy filler lines from the current window. (closes #8809)
diff --git a/src/version.c b/src/version.c
index 1c2231f..362129e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3556,
+/**/
     3555,
 /**/
     3554,