making intsels and panzoom work by updating x_pixels and listening to domain changes
making intsels and panzoom work by updating x_pixels and listening to domain changes

dmadeka/bqplot,rmenegaux/bqplot,rmenegaux/bqplot,dmadeka/bqplot,bloomberg/bqplot,bloomberg/bqplot,ssunkara1/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,ssunkara1/bqplot,SylvainCorlay/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot,bloomberg/bqplot,SylvainCorlay/bqplot