Taps Create with the people you picked (rows, in the order you picked them): creates the
group chat. Answers the new thread's handle. Fails with DirectInboxSeqIdUnknownError when
the session has not read the inbox yet.
ReadonlysearchTypes in the search field (query): looks up people and, in the one-to-one picker,
existing threads. Answers fresh item handles for both lists, recipients and threads; an
answer without results holds empty lists.
Taps the Group chat row and opens the picker again in group mode. Answers that picker's
handle, which offers createGroup().
The actions of DirectRecipientPickerScreen: the methods you call on its handle while the screen is open.