443         self._filteredrevs = val

   443         self._filteredrevs = val

   444         self._filteredrevs_hashcache = {}

   444         self._filteredrevs_hashcache = {}

   445 

   445 

   446     def delayupdate(self, tr):

   446     def delayupdate(self, tr):

   447         """delay visibility of index updates to other readers"""

   447         """delay visibility of index updates to other readers"""

   448 

   450 

   449         if not self._delayed:

   451         if not self._delayed:

   450             if len(self) == 0:

   452             if len(self) == 0:

   451                 self._divert = True

   453                 self._divert = True

   452                 if self._realopener.exists(self._indexfile + b'.a'):

   454                 if self._realopener.exists(self._indexfile + b'.a'):