Combined PDF has no outline

[remarkked]

When creating a combined PDF (actually, creating a document from another document by cutting some pages), the result contains no bookmarks.

Code sample:

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:pdfrx/pdfrx.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  MyApp({super.key});
  final Future<void> operatorManualLoadFuture = loadPdf();

  @override
  Widget build(context) => MaterialApp(
    debugShowCheckedModeBanner: false,
    home: Center(
      child: FutureBuilder(
        future: operatorManualLoadFuture,
        builder: (context, snapshot) => snapshot.connectionState != ConnectionState.done ? CircularProgressIndicator() : const SizedBox(),
      ),
    ),
  );
}

final PdfDocumentRef pdfDocumentRef = PdfDocumentRefAsset("assets/manual.pdf");

Future<void> loadPdf() async => await pdfDocumentRef.resolveListenable().load().then((pdfDownloadReport) => PdfDocument.openAsset(pdfDocumentRef.sourceName).then((pdfDocument) => pdfCut(pdfDocument)));

void pdfCut(PdfDocument pdfDocument) async {
  final List<int> newPagesIndices = List.generate(pdfDocument.pages.length, (j) => j)..removeWhere((pageIndex) =>
  (pageIndex > 10)
  );

  final cuttedDoc = await PdfDocument.createNew(sourceName: 'combined.pdf');
  cuttedDoc.pages = [
    for (int i in newPagesIndices) pdfDocument.pages[i]
  ];
  // Encode to PDF
  final bytes = await cuttedDoc.encodePdf();
  print("Original pdf bookmarks length: ${getBookmarksList(await pdfDocument.loadOutline(), 0).toList().length}");
  print("Combined pdf bookmarks length: ${getBookmarksList(await cuttedDoc.loadOutline(), 0).toList().length}");
}

Iterable<({PdfOutlineNode node, int level})> getBookmarksList(List<PdfOutlineNode>? outline, int level) sync* {
  if (outline == null) return;
  for (var node in outline)
  {
    yield (node: node, level: level);
    yield* getBookmarksList(node.children, level + 1);
  }
}

Output:
Original pdf bookmarks length: 36
Combined pdf bookmarks length: 0

Am I missing something?

[espresso3389]

In such case, edit pdfDocument.pages directly rather than use PdfDocument.createNew like this example.