src/hbcore/resources/themes/icons/hbdefault/scalable/qtg_mono_aspect_ratio_natural.svg
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<g fill-opacity="0.5" stroke-opacity="0.5">
<rect fill="none" height="30" width="30"/>
</g>
<path d="M2,3v24h26v-24h-26zm23,21h-20v-18h20v18z"/>
</svg>