scatter_matrix is incorrect when using color and non-sorted index

[shane-kercheval]

related to #3576

df = pd.DataFrame({
        'A': [1, 2, 3, 4],
        'B': [1, 2, 3, 4],
        'C': [1, 2, 3, 4],
    },
    index=[3, 2, 1, 0]
)
px.scatter_matrix(df)
px.scatter_matrix(df, color='C')

px.scatter_matrix(df) produces:

px.scatter_matrix(df, color='C') produces:

[MarcoGorelli]

Hi @shane-kercheval

Is this your expected output

?

[shane-kercheval]

Yes, thank you!