Specifying color adds _color entry hover-over

[ivirshup]

Description of expected behavior and the observed behavior

Specifying colors via .hvplot.scatter adds a _color field to hover over, and this seems unintentional.

Complete, minimal, self-contained example code that reproduces the issue

import vega_datasets
import hvplot.pandas

iris = vega_datasets.data.iris()

iris.hvplot.scatter(
    x="sepalWidth",
    y="sepalLength",
    hover_cols=["species"],
    color=iris["species"].map(
        {"setosa": "red", "virginica": "blue", "versicolor": "green"}
    ),
)

Screenshots or screencasts of the bug in action

Version info

hvplot 0.5.2 pandas 0.25.3 bokeh 1.4.0 python 3.7

[philippjfr]

Definitely unintentional, note that you can use HoloViews dim mapping to achieve the same thing:

import holoviews as hv
color=hv.dim("species").categorize(
        {"setosa": "red", "virginica": "blue", "versicolor": "green"}
    )

[maximlt]

I can reproduce.

[Azaya89]

I can reproduce this, and possibly tackle it but I have to ask: what is the intention here? Is it to remove the _color field entirely from the hover options or to make sure it doesn't appear as a private namespace but rather as color?