Quick fix for Envelope visual test
Quick fix for Envelope visual test

Extent function

djmiley/d3fc,bjedrzejewski/d3fc,alisd23/d3fc-d3v4,bjedrzejewski/d3fc,alisd23/d3fc-d3v4,bjedrzejewski/d3fc,djmiley/d3fc,alisd23/d3fc-d3v4,djmiley/d3fc