SHARED_STABLE_IDS

In this mode, ConcatAdapter will return true from hasStableIds and will require all added Adapters to have stable ids. Unlike ISOLATED_STABLE_IDS, ConcatAdapter will not override the returned item ids. In this mode, child Adapters must be aware of each-other and never return the same id unless and item is moved between Adapters. Adding an adapter without stable ids will result in an IllegalArgumentException.