Get language2 tests passing by not blocking on a foreground task

crates/language2/src/buffer.rs

@@ -434,7 +434,7 @@ impl Buffer {
         ));
 
         let text_operations = self.text.operations().clone();
-        cx.spawn(|_| async move {
+        cx.background_executor().spawn(async move {
             let since = since.unwrap_or_default();
             operations.extend(
                 text_operations

crates/language2/src/buffer_tests.rs

@@ -1943,6 +1943,7 @@ fn test_random_collaboration(cx: &mut AppContext, mut rng: StdRng) {
             .detach();
             buffer
         });
+
         buffers.push(buffer);
         replica_ids.push(i as ReplicaId);
         network.lock().add_peer(i as ReplicaId);