//remove button clicked
void AddFile_GUI::on_pushButton_4_clicked()
{
    //get selected rows
    QModelIndexList indexes = ui->tableView->selectionModel()->selectedRows();

    qSort(indexes.begin(), indexes.end());

    //remove last index in list
    while (!indexes.isEmpty())
    {
        model->removeRows(indexes.last().row(), 1);
        indexes.removeLast();
    }
}