feature: adding full client-side tests for regular window creation (#14)

feature: adding full client-side tests for regular window creation

Author: mattkae

packages/flutter/lib/src/widgets/window.dart

@@ -159,6 +159,8 @@ class _RegularWindowState extends State<RegularWindow> {
 
   @override
   Future<void> dispose() async {
+    super.dispose();
+
     if (_listener != null) {
       assert(_app != null);
       _app!._unregisterListener(_listener!);
@@ -168,13 +170,11 @@ class _RegularWindowState extends State<RegularWindow> {
     // we need to destroy the window on our way out.
     if (!_hasBeenDestroyed && _viewId != null) {
       // In the event of an argument error, we do nothing. We assume that
-      // the window has been successfully destroyed somehow else. 
+      // the window has been successfully destroyed somehow else.
       try {
         await destroyWindow(_viewId!);
       } on ArgumentError {}
     }
-
-    super.dispose();
   }
 
   @override