Soft hyphen protrudes from rest of text

#include <QApplication>
#include <QTextDocument>
#include <QTextEdit>
#include <QString>

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

    QTextEdit edit("Soft hyphen pro" + QString(QChar::SoftHyphen) + "trudes from rest of text");

    edit.document()->setDocumentMargin(20);
    edit.setAlignment(Qt::AlignJustify);
    edit.resize(150, 100);

    edit.show();

    return app.exec();
}