Add missing XSync to prevent BadDrawable error.

b=133713 r=serge sr=blizzard a=asa.


git-svn-id: svn://10.0.0.236/trunk@117763 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/modules/plugin/samples/default/unix/nullplugin.c

@@ -358,6 +358,8 @@ createPixmap(PluginInstance *This)
            style = gtk_widget_get_style((GtkWidget *)gdk_window->user_data);
            nullPluginGdkPixmap = gdk_pixmap_create_from_xpm_d(gdk_window , &mask,
                                              &style->bg[GTK_STATE_NORMAL], npnul320_xpm);
+	   /* Pixmap is created on original X session but used by new session */
+	   XSync(GDK_DISPLAY(), False);
        }
     }
 }