Legends for side colour plots

[alanocallaghan]

Currently layout(showlegend=FALSE) is run on the subplot object. This prevents any modifications of the colorbar using colorbar() but it also hides the legend for the side colour plots (and dendrogram traces). We can get around this by setting show_legend on the actual plotly objects as they are created. Unfortunately this is not consistent between plot_ly(..., showlegend=FALSE) and ggplotly() %>% layout(showlegend=FALSE). Furthermore, after adding the extra legend, it will be necessary to dodge the colorbar and the trace legend

Example of all legends together: http://imgur.com/a/TN7UK

[alanocallaghan]

It may be necessary to transition the side colour plots to native plotly to be able to fully control this

[alanocallaghan]

An (ugly) workaround is to set the overall legend y position to zero, which puts it at the bottom, hopefully out of the way of the colorbar. Ideally you would allow the user to move and resize both.

http://i.imgur.com/GC5rX5A.png

[alanocallaghan]

It seems that plotly doesn't respect colorbar adjustments in subplots for some reason. I'll raise an issue over there shortly

[talgalili]

Thanks for taking this issue on @alanocallaghan

Tal

[alanocallaghan]

Can be dealt with in #141