In x_set_tool_bar_lines of w32fns.c don't clear area on frames that are not visible.

* w32fns.c (x_set_tool_bar_lines): Don't clear area on frames
that are not visible.

src/ChangeLog

+2014-01-29  Martin Rudalics  <rudalics@gmx.at>
+
+	* w32fns.c (x_set_tool_bar_lines): Don't clear area on frames
+	that are not visible.
+
 2014-01-29  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* xmenu.c (create_and_show_popup_menu): Handle case when no key

src/w32fns.c

@@ -1713,7 +1713,7 @@ x_set_tool_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
   /* If the tool bar gets smaller, the internal border below it
      has to be cleared.  It was formerly part of the display
      of the larger tool bar, and updating windows won't clear it.  */
-  if (FRAME_INTERNAL_BORDER_WIDTH (f) != 0)
+  if (FRAME_INTERNAL_BORDER_WIDTH (f) != 0 && FRAME_VISIBLE_P (f))
     {
       int height = FRAME_INTERNAL_BORDER_WIDTH (f);
       int width = FRAME_PIXEL_WIDTH (f);