Argument type for Qt signal and slot, does const reference qualifiers matters?

Question

For signal and slot of below type

signals:
    void textChanged(const QString &);

public slots:
    void setText(const QString & text)

Answer 1

Qt checks a normalized signature, meaning

Normalization reduces whitespace to a minimum, moves 'const' to the front where appropriate, removes 'const' from value types and replaces const references with values.