Alpha and Size legends entries are not visible

[federicou]

The Alpha and Size aesthetics attributes don't have any legend reference

gg <- ggplot(data = mtcars,aes(x=disp,y=hp,size=qsec,alpha=cyl)) + geom_point()

ggplotly(gg)

[cpsievert]

Will likely have to wait for plotly/plotly.js#1668