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--- gtk+-2.6.4/gdk/x11/gdkwindow-x11.c	2005-01-25 20:51:36.000000000 +0200
+++ gtk+-2.6.4/gdk/x11/gdkwindow-x11.c	2005-04-06 16:19:35.350164320 +0300
@@ -1286,6 +1286,7 @@
   GdkToplevelX11 *toplevel;
   Atom atoms[7];
   gint i;
+  gint propmode;
 
   private = (GdkWindowObject*) window;
   toplevel = _gdk_x11_window_get_toplevel (window);
@@ -1295,6 +1296,12 @@
 
   update_wm_hints (window, TRUE);
   
+  /* If the window has _NET_WM_STATE key specified, use it as the property mode */
+  propmode = (gint)g_object_get_data (G_OBJECT (window), "_NET_WM_STATE");
+
+  if (!propmode) 
+    propmode = PropModeReplace;
+
   /* We set the spec hints regardless of whether the spec is supported,
    * since it can't hurt and it's kind of expensive to check whether
    * it's supported.
@@ -1366,10 +1373,11 @@
       XChangeProperty (xdisplay,
                        xwindow,
 		       gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE"),
-                       XA_ATOM, 32, PropModeReplace,
+                       XA_ATOM, 32, propmode,
                        (guchar*) atoms, i);
-    }
-  else 
+    } 
+  /* Don't delete the property, unless we are replacing it */
+  else if (propmode == PropModeReplace )
     {
       XDeleteProperty (xdisplay,
                        xwindow,