Add api to ibus for retreiving unused config values.

src/ibusconfig.h

Index: src/ibusconfig.h
diff --git a/src/ibusconfig.h b/src/ibusconfig.h
index fd256c1026f8da65d52b6c5a81d2c0a87137ca35..8d9679670c02b939a884a0102a9377a95eab4eb0 100644
--- a/src/ibusconfig.h
+++ b/src/ibusconfig.h
@@ -135,6 +135,20 @@ gboolean         ibus_config_set_value      (IBusConfig         *config,
 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
-