* handle message-ids a bit specially, update unit tests

lib/mu-str.h

@@ -158,6 +158,18 @@ char* mu_str_process_query_term (const char *qterm)
 	 G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
 
 
+/**
+ * Handle the message-id in a special way
+ *
+ * @param str the message-id str
+ * @param query is this a query?
+ *
+ * @return the massaged message-id
+ */
+char* mu_str_process_msgid (const char *str, gboolean query);
+
+
+
 /**
  * Fixup values for some fields in the DWIM manner:
  * - if term is date:YYYYMMDD, replace it with the range