Add api to ibus for retreiving unused config values.

src/ibusconfig.h

 /* vim:set et sts=4: */
 /* ibus - The Input Bus
  * Copyright (C) 2008-2010 Peng Huang <shawn.p.huang@gmail.com>
  * Copyright (C) 2008-2010 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 117 matching lines @@
  * @section: Section name of the configuration option.
  * @name: Name of the configure option its self.
  * @returns: TRUE if succeed; FALSE otherwise.
  *
  * Remove an entry of a configuration option.
  * @see_also: ibus_config_get_value.
  */
 gboolean         ibus_config_unset      (IBusConfig         *config,
                                          const gchar        *section,
                                          const gchar        *name);
+
+/**
+ * ibus_config_get_unused:
+ * @config: An IBusConfig
+ * @unread: GValue that holds a list of values that have been written but not
+ * read.
+ * @unwritten: GValue that holds a list of values that have been read but not
+ * written.
+ * @returns: TRUE if succeed; FALSE otherwise.
+ *
+ * Get the list of values that haven't been used properly.
+ */
+gboolean         ibus_config_get_unused     (IBusConfig         *config,
+                                             GValue             *unread,
+                                             GValue             *unwritten);
 G_END_DECLS
 #endif
-