Legend (categorical obs column) for scatterplot widget not consistent

[LucaMarconato]

Originally discovered here: #328 (comment).

To reproduce:

import numpy as np
import scanpy as sc

from spatialdata.datasets import blobs

np.random.seed(10)

sdata = blobs(length=1000, n_channels=3)

sc.pp.pca(
    sdata["table"],
    copy=False,
)

sc.pp.neighbors(
    sdata["table"],
    copy=False,
)
sc.tl.umap(
    sdata["table"],
    copy=False,
)

sdata["table"].obs["new_category"] = np.random.randint(0, 15, size=len(sdata["table"].obs))
sdata["table"].obs["new_category"] = sdata["table"].obs["new_category"].astype("category")

sc.pl.umap(sdata.tables["table"], color=["new_category"], show=True)


from napari_spatialdata import Interactive

Interactive(sdata)

Finally, open the scatterplot widget and make the UMAP as below (you need to open the labels layer first, since it is the one annotated by the table.

This is what is given (the two plots should have the same colors, but they don't).

[LucaMarconato]

• we should add tests for this