=== modified file 'src/window.c'
--- src/window.c	2013-01-11 23:08:55 +0000
+++ src/window.c	2013-01-19 09:54:07 +0000
@@ -4207,8 +4207,15 @@
 
   root = FRAME_ROOT_WINDOW (f);
   r = XWINDOW (root);
-  value = call2 (Qwindow_resize_root_window_vertically,
-		 root, make_number (- delta));
+  if (WINDOW_LIVE_P (root))
+    {
+      r->new_total = make_number (XFASTINT (r->total_lines) - delta);
+      value = make_number (- delta);
+    }
+  else
+    value = call2 (Qwindow_resize_root_window_vertically,
+		   root, make_number (- delta));
+
   if (INTEGERP (value) && window_resize_check (r, 0))
     {
       block_input ();
@@ -4245,8 +4252,15 @@
     {
       root = FRAME_ROOT_WINDOW (f);
       r = XWINDOW (root);
-      value = call2 (Qwindow_resize_root_window_vertically,
-		     root, make_number (size - 1));
+      if (WINDOW_LIVE_P (root))
+	{
+	  r->new_total = make_number (XFASTINT (r->total_lines) + size - 1);
+	  value = make_number (size - 1);
+	}
+      else
+	value = call2 (Qwindow_resize_root_window_vertically,
+		       root, make_number (size - 1));
+
       if (INTEGERP (value) && window_resize_check (r, 0))
 	{
 	  block_input ();