The damaged region for window decorations is incorrect

// \a size is without margins
static QRegion marginsRegion(const QSize &size, const QMargins &margins)
{
    QRegion r;
    r += QRect(0, 0, size.width(), margins.top()); // top
    r += QRect(0, size.height()+margins.top(), size.width(), margins.bottom()); //bottom
    r += QRect(0, 0, margins.left(), size.height()); //left
    r += QRect(size.width()+margins.left(), 0, margins.right(), size.height()); // right
    return r;
}

static QRegion marginsRegion(const QSize &size, const QMargins &margins)
{
    QRegion r;
    r += QRect(0, 0, size.width() + margins.left(), margins.top()); // top
    r += QRect(size.width() + margins.left(), 0, margins.right(), size.height() + margins.top()); // right
    r += QRect(margins.left(), size.height() + margins.top(), size.width() + margins.right(), margins.bottom()); //bottom
    r += QRect(0, margins.top(), margins.left(), size.height() + margins.bottom()); //left
    return r;
}