Fixed change detection for viewport (after recent spring change)
Fixed change detection for viewport (after recent spring change)

shaunstanislaus/openseadragon,jmnetus/openseadragon,daverome/openseadragon,mcanthony/openseadragon,msalsbery/openseadragon,jmnetus/openseadragon,openseadragon/openseadragon,LarissaSmith/openseadragon,lidasong2014/openseadragon,shaunstanislaus/openseadragon,seanich/openseadragon,seanich/openseadragon,lidasong2014/openseadragon,Iced-Tea/openseadragon,rdlester/openseadragon,goofwear/openseadragon,ricochet2200/openseadragon,avandecreme/openseadragon,rdlester/openseadragon,avandecreme/openseadragon,openseadragon/openseadragon,mcanthony/openseadragon,goofwear/openseadragon,TMUND/openseadragon,ricochet2200/openseadragon,LarissaSmith/openseadragon,daverome/openseadragon,msalsbery/openseadragon,TMUND/openseadragon,Iced-Tea/openseadragon