Triggers don't obey collision groups and layers

Unless i'm messing something up over here it seems that Triggers don't obey collision groups and layers. I've added the following to t2dTrigger::onCollision() to fix this:

UPDATE: Fixed because it was wrong. ;)

void t2dTrigger::onCollision(t2dPhysics::cCollisionStatus* collisionStatus)
{
   t2dSceneObject* collider = collisionStatus->mDstObject;
   if (collider == this)
      collider = collisionStatus->mSrcObject;

   // Skip this collision if it's not in the right groups
   if (  collider->getGraphGroupMask() & getCollisionGroupMask() &&
         collider->getLayerMask() & getCollisionLayerMask() )
   {
      // Add the collider to the current collider list... if it's not already colliding.
      if (!isColliding(collider, mCurrentColliders))
         mColliders[mCurrentColliders].push_back(collider);
   }
}

Still i wonder if this is really a bug further up the call stack... shouldn't the caller of this function have already used the collision groups and layers to cull potential collision shapes first?