QwtText background padding

[Uwe]

I would like my QwtText to have some padding

You could try to do some formatting using the rich text syntax or simply overload QwtPlotTextLabel::textRect():

QRectF YourTextLabel::textRect( 
    const QRectF &rect, const QSizeF &textSize ) const
{
   QRectF rect = QwtPlotTextLabel::textRect( rect, textSize );
   rerturn rect.adjusted( ... );
}

QRectF YourTextLabel::textRect( 
    const QRectF &rect, const QSizeF &textSize ) const
{
   QRectF rect = QwtPlotTextLabel::textRect( rect, textSize );
   rerturn rect.adjusted( ... );
}

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Uwe