feat: paste list children nodes (#863)

* feat: paste list children nodes

also export copy paste extension so we can use it in AppFlowy

* fix: unnecessary import

lib/src/editor/editor_component/editor_component.dart

@@ -21,6 +21,7 @@ export 'service/scroll_service.dart';
 export 'service/scroll_service_widget.dart';
 export 'service/selection_service.dart';
 export 'service/selection_service_widget.dart';
+export 'service/shortcuts/command/copy_paste_extension.dart';
 // shortcuts
 export 'service/shortcut_events.dart';
 export 'style/default_text_span_decorator_for_attribute.dart';

lib/src/editor/editor_component/service/shortcuts/command/copy_paste_extension.dart

@@ -1,5 +1,11 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 
+final _listTypes = [
+  BulletedListBlockKeys.type,
+  TodoListBlockKeys.type,
+  NumberedListBlockKeys.type,
+];
+
 extension EditorCopyPaste on EditorState {
   Future<void> pasteSingleLineNode(Node insertedNode) async {
     final selection = await deleteSelectionIfNeeded();
@@ -31,6 +37,9 @@ extension EditorCopyPaste on EditorState {
     } else if (insertedDelta != null) {
       // if the node is not empty, insert the delta from inserted node after the selection.
       transaction.insertTextDelta(node, selection.endIndex, insertedDelta);
+      if (_listTypes.contains(node.type) && insertedNode.children.isNotEmpty) {
+        transaction.insertNodes(node.path + [0], insertedNode.children);
+      }
     }
     await apply(transaction);
   }

lib/src/editor/editor_component/service/shortcuts/command/paste_command.dart

@@ -1,5 +1,4 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
-import 'package:appflowy_editor/src/editor/editor_component/service/shortcuts/command/copy_paste_extension.dart';
 import 'package:flutter/material.dart';
 
 final List<CommandShortcutEvent> pasteCommands = [