QLineEdit setInputMask and required character(s)

Setting a required character does not work properly. A space is added instead of doing nothing if the value entered is not valid for the required field but is valid for the following one.

To reproduce:

#include <QApplication>
#include <QLineEdit>

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);

	QLineEdit *le = new QLineEdit;
	le->setInputMask("D000"); // le->setInputMask("AA0AA0");
	le->show();

	return app.exec();
}

CASE le->setInputMask("D000");
entering 00 return " 00"

CASE le->setInputMask("AA0AA0");
entering 00 return " 0 0"