qtextcursor setposition doesn't work

[doc_symbiosis]

Hello,

in a program I have the following code:

void FindWidget::slotClose() {
    cursor = mTextpage->textCursor();
    qDebug() << "cursor position on close start: " << cursor.position();
    if ( cursor.position() == -1) {
        cursor.setPosition(QTextCursor::Start,QTextCursor::MoveAnchor);
        qDebug() << "cursor position after setPosition: " << cursor.position();
 
        mTextpage->setTextCursor(cursor);
    }
    mTextpage->setFocus();
    close();
}

void FindWidget::slotClose() {
    cursor = mTextpage->textCursor();
    qDebug() << "cursor position on close start: " << cursor.position();
    if ( cursor.position() == -1) {
        cursor.setPosition(QTextCursor::Start,QTextCursor::MoveAnchor);
        qDebug() << "cursor position after setPosition: " << cursor.position();

        mTextpage->setTextCursor(cursor);
    }
    mTextpage->setFocus();
    close();
}

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Example output is the following

cursor position on close start:  -1 
cursor position after setPosition:  -1

cursor position on close start:  -1 
cursor position after setPosition:  -1

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Anyone got an idea, what's goind wrong here? I also tried, not to use cursor as member and used the following instead:

QTextCursor cursor = mTextpage->textCursor();

QTextCursor cursor = mTextpage->textCursor();

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Also, same result.

Thanks in advance for any help.