fix(legacy): keep the event bridge compiling when nativeapi adds events

lib/src/legacy/window_manager.dart

@@ -4,7 +4,8 @@ import 'dart:async';
 import 'dart:io';
 import 'dart:ui' show Brightness, Color, Offset, PlatformDispatcher, Rect, Size;
 
-import 'package:flutter/foundation.dart' show ObserverList, VoidCallback;
+import 'package:flutter/foundation.dart'
+    show ObserverList, VoidCallback, visibleForTesting;
 import 'package:flutter/painting.dart' show Alignment;
 import 'package:nativeapi/nativeapi.dart' as nativeapi;
 import 'package:nativeapi_flutter/nativeapi_flutter.dart'
@@ -66,6 +67,15 @@ class WindowManager {
   nativeapi.Window? _window;
   nativeapi.ListenerId? _nativeListenerId;
 
+  /// Addresses [window] instead of the platform's current window, or goes
+  /// back to the current window with null. For tests of this bridge only.
+  @visibleForTesting
+  void debugBindWindow(nativeapi.Window? window) {
+    _unwireNativeEvents();
+    _window = window;
+    if (_listeners.isNotEmpty || _isPreventClose) _wireNativeEvents();
+  }
+
   bool _isPreventClose = false;
   bool _isDestroying = false;
   bool _isMaximized = false;
@@ -791,10 +801,10 @@ class WindowManager {
       case nativeapi.WindowMovedEvent():
         _emit(kWindowEventMove);
         _emit(kWindowEventMoved);
-      case nativeapi.WindowCreatedEvent():
-      case nativeapi.WindowClosedEvent():
-      case nativeapi.WindowPropertyChangedEvent():
-      case nativeapi.WindowOcclusionChangedEvent():
+      // Created, closed, property and occlusion changes have no 0.5.x
+      // counterpart. A default rather than a list keeps this switch compiling
+      // when a nativeapi 0.5.x release adds a WindowEvent subclass.
+      default:
         break;
     }
   }

test/legacy_event_compat_test.dart

@@ -0,0 +1,86 @@
+// How package:window_manager/legacy.dart treats nativeapi window events that
+// 0.5.x had no counterpart for.
+// ignore_for_file: deprecated_member_use_from_same_package
+
+import 'dart:async';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:nativeapi/nativeapi.dart' as nativeapi;
+import 'package:window_manager/legacy.dart';
+
+class _Recorder with WindowListener {
+  final List<String> events = <String>[];
+
+  @override
+  void onWindowEvent(String eventName) => events.add(eventName);
+}
+
+// A nativeapi window simulated in Dart; no native window is created.
+class _FakeNativeWindow extends nativeapi.Window {
+  _FakeNativeWindow() : super.borrowed(0);
+
+  FutureOr<void> Function(nativeapi.WindowEvent)? _callback;
+
+  @override
+  bool get isMinimized => false;
+
+  @override
+  bool get isMaximized => false;
+
+  @override
+  bool get isFullScreen => false;
+
+  @override
+  nativeapi.ListenerId addListener(
+    FutureOr<void> Function(nativeapi.WindowEvent) listener,
+  ) {
+    _callback = listener;
+    return 1;
+  }
+
+  @override
+  bool removeListener(nativeapi.ListenerId id) {
+    _callback = null;
+    return true;
+  }
+
+  Future<void> fire(nativeapi.WindowEvent event) async {
+    await _callback?.call(event);
+  }
+}
+
+void main() {
+  late _FakeNativeWindow fake;
+  late _Recorder listener;
+
+  setUp(() {
+    fake = _FakeNativeWindow();
+    listener = _Recorder();
+    windowManager.debugBindWindow(fake);
+    windowManager.addListener(listener);
+  });
+
+  tearDown(() {
+    windowManager.removeListener(listener);
+    windowManager.debugBindWindow(null);
+  });
+
+  test('events without a 0.5.x counterpart are dropped', () async {
+    await fake.fire(const nativeapi.WindowCreatedEvent(windowId: 1));
+    await fake.fire(const nativeapi.WindowClosedEvent(windowId: 1));
+    await fake.fire(
+      const nativeapi.WindowOcclusionChangedEvent(
+        windowId: 1,
+        occlusionState: nativeapi.WindowOcclusionState.occluded,
+      ),
+    );
+    expect(listener.events, isEmpty);
+  });
+
+  test('events with a 0.5.x counterpart still arrive', () async {
+    await fake.fire(const nativeapi.WindowFocusedEvent(windowId: 1));
+    await fake.fire(const nativeapi.WindowCreatedEvent(windowId: 1));
+    await fake.fire(const nativeapi.WindowBlurredEvent(windowId: 1));
+    expect(listener.events, [kWindowEventFocus, kWindowEventBlur]);
+  });
+}