Reproject geometries in WMS GetFeatureInfo responses when info_format is GML

When making a GetFeatureInfo request with info_format=application/vnd.ogc.gml, the response includes geometries in the layer's native projection, rather than the display projection. It would be useful to be able to get these geometries back in the display projection (for example, so OpenLayers maps can highlight a feature in WMS when it is clicked, regardless of which layers are visible.