fix: delete style widget error

frontend/app_flowy/packages/flowy_editor/lib/service/editor_service.dart

@@ -1,4 +1,3 @@
-import 'package:flowy_editor/render/rich_text/rich_text.dart';
 import 'package:flutter/material.dart';
 
 import 'package:flowy_editor/editor_state.dart';
@@ -8,6 +7,7 @@ import 'package:flowy_editor/render/rich_text/checkbox_text.dart';
 import 'package:flowy_editor/render/rich_text/heading_text.dart';
 import 'package:flowy_editor/render/rich_text/number_list_text.dart';
 import 'package:flowy_editor/render/rich_text/quoted_text.dart';
+import 'package:flowy_editor/render/rich_text/rich_text.dart';
 import 'package:flowy_editor/service/input_service.dart';
 import 'package:flowy_editor/service/internal_key_event_handlers/arrow_keys_handler.dart';
 import 'package:flowy_editor/service/internal_key_event_handlers/copy_paste_handler.dart';

frontend/app_flowy/packages/flowy_editor/lib/service/internal_key_event_handlers/enter_without_shift_in_text_node_handler.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
+import 'package:flowy_editor/document/attributes.dart';
 import 'package:flowy_editor/document/node.dart';
 import 'package:flowy_editor/document/position.dart';
 import 'package:flowy_editor/document/selection.dart';
@@ -91,7 +92,8 @@ FlowyKeyEventHandler enterWithoutShiftInTextNodesHandler =
     ..insertNode(
       textNode.path.next,
       textNode.copyWith(
-        attributes: needCopyAttributes ? textNode.attributes : {},
+        attributes:
+            needCopyAttributes ? Attributes.from(textNode.attributes) : {},
         delta: textNode.delta.slice(selection.end.offset),
       ),
     )