create new DeviceListReceived event to avoid race conditions in short–lived client applications

crates/buttplug_client/src/client_event_loop.rs

@@ -301,6 +301,7 @@ where
           let device = self.create_client_device(device);
           self.send_client_event(ButtplugClientEvent::DeviceAdded(device));
         }
+        self.send_client_event(ButtplugClientEvent::DeviceListReceived);
         true
       }
     }

crates/buttplug_client/src/lib.rs

@@ -123,6 +123,9 @@ pub enum ButtplugClientEvent {
   /// Emitted when a scanning session (started via a StartScanning call on
   /// [ButtplugClient]) has finished.
   ScanningFinished,
+  /// Emitted when the device list is received as a response to a
+  /// DeviceListRequest call, which is sent during the handshake.
+  DeviceListReceived,
   /// Emitted when a device has been added to the server. Includes a
   /// [ButtplugClientDevice] object representing the device.
   DeviceAdded(ButtplugClientDevice),

crates/buttplug_tests/tests/test_client.rs

@@ -141,6 +141,10 @@ async fn test_client_scanning_finished() {
   let (client, _) = test_client_with_device().await;
   let mut recv = client.event_stream();
   assert!(client.start_scanning().await.is_ok());
+  assert!(matches!(
+    recv.next().await.expect("Test, assuming infallible."),
+    ButtplugClientEvent::DeviceListReceived
+  ));
   assert!(matches!(
     recv.next().await.expect("Test, assuming infallible."),
     ButtplugClientEvent::ScanningFinished

crates/buttplug_tests/tests/util/device_test/client/client_v3/client.rs

@@ -117,6 +117,9 @@ pub enum ButtplugClientEvent {
   /// Emitted when a device has been removed from the server. Includes a
   /// [ButtplugClientDevice] object representing the device.
   DeviceRemoved(Arc<ButtplugClientDevice>),
+  /// Emitted when the device list is received as a response to a
+  /// DeviceListRequest call, which is sent during the handshake.
+  DeviceListReceived,
   /// Emitted when a client has not pinged the server in a sufficient amount of
   /// time.
   PingTimeout,

crates/buttplug_tests/tests/util/device_test/client/client_v3/client_event_loop.rs

@@ -309,6 +309,7 @@ where
           let device = self.create_client_device(d);
           self.send_client_event(ButtplugClientEvent::DeviceAdded(device));
         }
+        self.send_client_event(ButtplugClientEvent::DeviceListReceived);
         true
       }
     }