fix(core): a folder listed just as its create lands is listed from the database (B177)

crates/pdfs-core/src/db/tests.rs

@@ -3282,6 +3282,37 @@ fn a_stand_in_keeps_its_access_once_its_create_has_landed() {
     );
 }
 
+#[test]
+fn a_stand_in_folder_stays_listed_once_its_create_has_landed() {
+    let db = Db::open_in_memory().unwrap();
+    db.upsert_node(&folder("parent", None, "My Files")).unwrap();
+    let parent = uid("parent").to_string();
+    let lid = db.add_local_row(&parent, "dir", true, 1).unwrap();
+    let local = local_uid(lid);
+    let stand_in = NodeUid::new(VolumeId::from("local"), LinkId::from(lid.to_string()));
+    let mut node = folder("new", Some("parent"), "dir");
+    node.uid = stand_in.clone();
+    db.upsert_node(&node).unwrap();
+    db.set_listed(&stand_in, true).unwrap();
+    let real = uid("real").to_string();
+    let (id, _) = db
+        .enqueue_op(&op_on(OP_MKDIR, &local, Some(&parent)))
+        .unwrap();
+    db.claim_next_due_op(1).unwrap().unwrap();
+    db.finish_create(id, None, &landing(&local, &real, &parent, "dir"), |_| None)
+        .unwrap();
+
+    // The tree still names the folder by its stand-in for a moment; a listing
+    // asked by it must not go to Drive, which has never heard of it.
+    assert!(
+        db.children_if_listed(&stand_in)
+            .unwrap()
+            .is_some_and(|kids| kids.is_empty())
+    );
+    db.set_listed(&stand_in, false).unwrap();
+    assert!(db.children_if_listed(&uid("real")).unwrap().is_none());
+}
+
 #[test]
 fn a_node_queued_under_both_its_uids_is_sent_one_op_at_a_time() {
     let db = Db::open_in_memory().unwrap();