fix: 评论回复State对象失效

lib/pages/video/detail/reply_new/view.dart

@@ -111,6 +111,7 @@ class _VideoReplyNewDialogState extends State<VideoReplyNewDialog>
     super.didChangeMetrics();
     WidgetsBinding.instance.addPostFrameCallback((_) {
       // 键盘高度
+      if (mounted) {
         final viewInsets = EdgeInsets.fromViewPadding(
             View.of(context).viewInsets, View.of(context).devicePixelRatio);
         _debouncer.run(() {
@@ -123,6 +124,7 @@ class _VideoReplyNewDialogState extends State<VideoReplyNewDialog>
             }
           }
         });
+      }
     });
   }
 
@@ -131,6 +133,7 @@ class _VideoReplyNewDialogState extends State<VideoReplyNewDialog>
     WidgetsBinding.instance.removeObserver(this);
     _replyContentController.dispose();
     replyContentFocusNode.removeListener(() {});
+    replyContentFocusNode.dispose();
     super.dispose();
   }