Unsolved QFileSystemModel setData problem

[chabo]

Hi,
I would like to overwrite file/directory by rename if it already exists.

My setData function:

bool MyModel::setData(const QModelIndex &idx, const QVariant &value, int role)
{
  if (!idx.isValid()
    || idx.column() != 0
    || role != Qt::EditRole
    || (flags(idx) & Qt::ItemIsEditable) == 0) {
    return false;
  }

  QString newName = value.toString();
  QString oldName = idx.data().toString();
  
  if (newName.isEmpty())
    return false;

  if (newName == oldName)
    return true;

  if (newName.compare(oldName, Qt::CaseInsensitive))
  {
    QModelIndex newIndex = index(filePath(parent(idx)) + QDir::separator() + newName);

    if (newIndex.isValid())
    {
      remove(newIndex);
    }
  }

  return QFileSystemModel::setData(idx, value, role);
}

After rename I've got two same elements in view.
Problem seems to be in QFileSystemModel::setData when trying to keep selection after renaming.
I am using Qt version 5.5
Can someone help me please?