void purple_blist_update_groups_cache ( PurpleGroup* group, const char* new_name )
Updates the groups hash table when a group has been renamed. This only updates the cache, the caller is responsible for the actual renaming of the group after updating the cache.
The group whose name will be changed.
The data is owned by the caller of the function.
The new name of the group.
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.