test/plugins/moveElemsAttrsToGroup.05.svg

<svg xmlns="http://www.w3.org/2000/svg">
    <g attr1="val1">
        <g fill="red" color="#000" opacity="1">
            text
        </g>
        <circle fill="red" color="#000" opacity="1"/>
    </g>
</svg>

@@@

<svg xmlns="http://www.w3.org/2000/svg">
    <g attr1="val1" fill="red" color="#000">
        <g opacity="1">
            text
        </g>
        <circle opacity="1"/>
    </g>
</svg>