QValidator::changed() is not used by QLineEdit

auto validator = new QIntValidator();
validator->setRange(0, 9);
lineEdit->setValidator(validator);
lineEdit->setText("99"); // "99" is invalid, but setText() ignores the validator
validator->setRange(10, 99);
// From here, the text "99" is valid: QLineEdit::hasAcceptableInput() returns true
// However, the QLineEdit has not received the changed() signal and QWidgetLineControl::m_validInput is still false
// This situation allows user to type anything e.g. a letter, meaning that we could end up having "99a" as text.