[horde] Group Caching Ineffective

[Adam Tauno Williams]

I've implemented a custom Group provider that makes calls to our  
[OpenGroupware Coils] server.  I've also implemented a user provider.   
  User provider works great.  The group provider also works well but  
there are constant list-groups calls being made to the server even  
with group caching enabled.  It calls over a dozen times with a page  
load; which seems crazy.

Horde 4.0.8

Is this a deficiency in the group cache [it just doesn't cache these  
requests] or possibly something I'm doing wrong?  Drivers, looking at  
the others, don't seem to implement any caching of their own so I  
assume this happens at the 'owner' of the Group driver object.