Now I want to filter the first column (Projekt) to the content of a QLineEdit.

void MainWindow::on_txt_projekt_2_textEdited(const QString &arg1){
    extern QStandardItemModel globalEtiketten;
    QSortFilterProxyModel tempmodel;
    tempmodel.setSourceModel(&globalEtiketten);
    tempmodel.setFilterCaseSensitivity(Qt::CaseInsensitive);
    tempmodel.setFilterKeyColumn(0);
    tempmodel.setFilterWildcard(arg1);
    ui->etikettenView->setModel(&tempmodel);
}

But after pressing for example "4" in the QLineEdit, the table is empty.

As the code gets compiled without error, I think I have given some parameter wrong. Who can tell me which one?

Thank you
Thomas