Custom QFileDialog

  QFileDialog *f = new QFileDialog();
  f->setOption(QFileDialog::DontUseNativeDialog, true);  // we need qt layout

  QGridLayout *layout = static_cast<QGridLayout *>(f->layout());

  QList<QPair<QLayoutItem *, QList<int> > > moved_items;
  f->show();
  for (int i = 0; i < layout->count(); i++) {
    int row, column, rowSpan, columnSpan;
    layout->getItemPosition(i, &row, &column, &rowSpan, &columnSpan);
    if (row >= 2) {
      QList<int> list;
      list << (row + 1) << column << rowSpan << columnSpan;
      moved_items << qMakePair(layout->takeAt(i), list);
      i--;  // takeAt has shifted the rest items
    }
  }

  for (int i = 0; i < moved_items.count(); i++) {
    layout->addItem(moved_items[i].first, moved_items[i].second[0],
                    moved_items[i].second[1], moved_items[i].second[2],
                    moved_items[i].second[3]);
  }

  QTableWidget *tableWidget = new QTableWidget();
  layout->addWidget(tableWidget, 5, 0, 1, 5);
  auto nn = new QTextBrowser(this);
  layout->addWidget(nn, 4, 0, 1, 1);
  nn->setText("WWWWWWWWwkjawjkqkwqk\n;lsa;lsa;l\wq\n");
  nn->setMaximumHeight(100);