QUrl::PreferLocalFile is not equal to toLocalFIle

ui->setupUi(this);
connect(ui->openFileButton, &QPushButton::clicked, this, [=]() {
	QString fileName = QFileDialog::getOpenFileName(this, "Open a file");
	ui->stringLineEdit->setText(fileName);

	QUrl url = QUrl::fromLocalFile(fileName);
	ui->toLocalFileLineEdit->setText(url.toLocalFile());
	ui->urlLineEdit->setText(url.toString(QUrl::PreferLocalFile));
});