When having a preview decorated mount, then via that mount only preview decorated mounts should be accessible

Currently, the DefaultHstLinkCreator contains code like this:

List<Mount> mountsForHostGroup = mount.getVirtualHost().getVirtualHosts().getMountsByHostGroup(mount.getVirtualHost().getHostGroupName());

if (Mount.PREVIEW_NAME.equals(mount.getType()) && isCmsRequest)

{ mountsForHostGroup = decorateMountsToPreview(mountsForHostGroup); }

It would be better and less error prone, when 'mount is a preview docorated mount', that mount.getVirtualHost().getVirtualHosts().getMountsByHostGroup would return preview decorated mounts only (and all other model methods as well)