Save under on all windows

[Wouter van Kleunen <w a p vankleunen student utwente nl>]

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Apparantly xfree can already do backing store and save under. This patch will 
enable it on all input/output windows. X probably has to be started with +bs, 
i'm not sure. You can check if backing store is running using xwininfo. 

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+++ gdk/x11/gdkwindow-x11.c	22 Apr 2003 08:27:39 -0000
@@ -578,12 +578,15 @@
       xattributes.colormap = GDK_COLORMAP_XCOLORMAP (draw_impl->colormap);
       xattributes_mask |= CWColormap;
 
+      xattributes.save_under = True;
+      xattributes.backing_store = Always;
+      xattributes_mask |= CWSaveUnder | CWBackingStore;
+
       if (private->window_type == GDK_WINDOW_TEMP)
 	{
-	  xattributes.save_under = True;
 	  xattributes.override_redirect = True;
 	  xattributes.cursor = None;
-	  xattributes_mask |= CWSaveUnder | CWOverrideRedirect;
+	  xattributes_mask |= CWOverrideRedirect;
 	}
     }
   else