Add timeout for navigator item index change handler. Fix for issue# 1130
Add timeout for navigator item index change handler. Fix for issue# 1130

LarissaSmith/openseadragon,openseadragon/openseadragon,seanich/openseadragon,seanich/openseadragon,openseadragon/openseadragon,LarissaSmith/openseadragon