setSaved method
Pin & Save: restricts the result to messages the logged-in user has saved.
Saves are per-viewer and span every conversation, so this is usually used without a setUID/setGUID scope. Results come back newest-saved-first, and a message the user has since lost access to is dropped server-side.
Implementation
MessagesRequestBuilder setSaved(bool saved) {
this.saved = saved;
return this;
}