test/plugins/removeUselessStrokeAndFill.02.svg

<svg xmlns="http://www.w3.org/2000/svg">
    <defs>
        <g id="test">
            <rect fill-opacity=".5" width="100" height="100"/>
        </g>
    </defs>
    <circle fill="none" fill-rule="evenodd" cx="60" cy="60" r="50"/>
    <circle fill="red" fill-opacity="0" cx="90" cy="90" r="50"/>
    <circle fill-opacity="0" fill-rule="evenodd" cx="90" cy="60" r="50"/>
    <circle fill="red" fill-opacity=".5" cx="60" cy="60" r="50"/>
    <g fill="none">
        <circle fill-opacity=".5" cx="60" cy="60" r="50"/>
    </g>
</svg>

@@@

<svg xmlns="http://www.w3.org/2000/svg">
    <defs>
        <g id="test">
            <rect fill-opacity=".5" width="100" height="100"/>
        </g>
    </defs>
    <circle fill="none" cx="60" cy="60" r="50"/>
    <circle fill="none" cx="90" cy="90" r="50"/>
    <circle cx="90" cy="60" r="50" fill="none"/>
    <circle fill="red" fill-opacity=".5" cx="60" cy="60" r="50"/>
    <g fill="none">
        <circle cx="60" cy="60" r="50"/>
    </g>
</svg>