+ /* 2. removing all "folder:" stemmed terms */
+ while (1) {
+ i = message->doc.termlist_begin ();
+ i.skip_to (zfolder_prefix);
+
+ /* Terminate loop when no terms remain with desired prefix. */
+ if (i == message->doc.termlist_end () ||
+ strncmp ((*i).c_str (), zfolder_prefix, zfolder_prefix_len))
+ {
+ break;
+ }
+
+ try {
+ message->doc.remove_term ((*i));
+ } catch (const Xapian::InvalidArgumentError) {
+ /* Ignore failure to remove non-existent term. */
+ }
+ }
+
+ /* 3. adding back terms for all remaining filenames of the message. */