QFileDialog::getOpenFileName() clear history

[std.approach]

correction:
the path with QSetting doesnt work
second one with QFileDialog::setHistory - doesnt work, too (as I said before).
As did I placed below:
step1. add public function to QFileDialog (yes, it should edit the Qt source)

//qfiledialog.h
void clearCurrentHistoryLocation();

//qfiledialog.h
void clearCurrentHistoryLocation();

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implementation:

//qfiledialog.cpp
void QFileDialog::clearCurrentHistoryLocation()
{
	Q_D(QFileDialog);
	this->setHistory(QStringList());
	d->clearCurrentHistoryLocation();
}

//qfiledialog.cpp
void QFileDialog::clearCurrentHistoryLocation()
{
	Q_D(QFileDialog);
	this->setHistory(QStringList());
	d->clearCurrentHistoryLocation();
}

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step2. add function to QFileDialogPrivate

//qfiledialog_p.h
void clearCurrentHistoryLocation();

//qfiledialog_p.h
void clearCurrentHistoryLocation();

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implementation:

void clearCurrentHistoryLocation()
	{
		currentHistory.clear();
		currentHistoryLocation=-1;
	}

void clearCurrentHistoryLocation()
	{
		currentHistory.clear();
		currentHistoryLocation=-1;
	}

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it works, I garantee that)