Seaborn: Support stacked bars in hue FacetGrid histograms

[andrebalg]

At the moment, it seems that FacetGrid does not support histtype='barstacked' when using FacetGrids based on hue. For example:

df = sns.load_dataset("iris")
g = sns.FacetGrid(df, hue="species", size=4, aspect=1.3)
g.map(plt.hist, "sepal_length", histtype='barstacked', stacked=True);
plt.legend();

yields:

When the user specifies:

histtype='barstacked'

It should rather yield something like:

I know this specific case is handled by default for hue plt.hist in PairGrid, but I would be happy to implement it in FacetGrid as well.
I think it would be nice to have for complex FacetGrids involving both hue and col/row.

Is this something you are interested in merging?

[mwaskom]

Given the differences between how PairGrid and FacetGrid work, this would be a very messy change.

If you really want to use a stacked hist, it would be better to define a function that wraps plt.hist in a way that is more compatible with the FacetGrid api. See this notebook for a recipe.

[rasbt]

Sorry for the follow-up on this rather old issue, but how do you create the stacked histograms in the pairplot (scatterplot matrix) then? E.g.,