Broken colors with scale_color_discrete and groups

[IKupriyanov-HORIS]

Python:

mpg_df = pd.read_csv('https://jetbrains.bintray.com/lets-plot/mpg.csv')
ggplot(mpg_df, aes(x='displ', y='hwy')) \
        + geom_point(aes(color='cyl'))\
        + geom_smooth(aes(color='cyl', group='cyl'), method='lm', deg=2, size=1) \
        + scale_color_discrete()

Plot spec for demo:

"""
{
  "data": {
    "Unnamed: 0": [220, 56, 60, 208, 226, 11, 120, 144, 187, 59, 234, 146, 112, 90, 106, 38, 73, 230, 117, 96],
    "manufacturer": ["volkswagen", "dodge", "dodge", "volkswagen", "volkswagen", "audi", "hyundai", "nissan", "toyota", "dodge", "volkswagen", "nissan", "hyundai", "ford", "honda", "dodge", "dodge", "volkswagen", "hyundai", "ford"],
    "model": ["jetta", "dakota pickup 4wd", "durango 4wd", "gti", "new beetle", "a4 quattro", "tiburon", "altima", "camry solara", "durango 4wd", "passat", "altima", "sonata", "f150 pickup 4wd", "civic", "caravan 2wd", "ram 1500 pickup 4wd", "passat", "tiburon", "mustang"],
    "displ": [2.8, 5.2, 4.7, 2.0, 2.5, 2.0, 2.7, 2.5, 2.2, 4.7, 3.6, 3.5, 2.4, 5.4, 1.8, 2.4, 5.7, 2.0, 2.0, 4.6],
    "year": [1999, 1999, 2008, 1999, 2008, 2008, 2008, 2008, 1999, 2008, 2008, 2008, 2008, 2008, 2008, 1999, 2008, 2008, 1999, 1999],
    "cyl": [6, 8, 8, 4, 5, 4, 6, 4, 4, 8, 6, 6, 4, 8, 4, 4, 8, 4, 4, 8],
    "trans": [ "auto(l4)", "manual(m5)", "auto(l5)", "manual(m5)", "manual(m5)", "auto(s6)", "auto(l4)", "auto(av)", "auto(l4)", "auto(l5)", "auto(s6)", "manual(m6)", "manual(m5)", "auto(l4)", "auto(l5)", "auto(l3)", "auto(l5)", "auto(s6)", "manual(m5)", "manual(m5)"],
    "drv": [ "f", "4", "4", "f", "f", "4", "f", "f", "f", "4", "f", "f", "f", "4", "f", "f", "4", "f", "f", "r"],
    "cty": [ 16, 11, 9, 21, 20, 19, 17, 23, 21, 13, 17, 19, 21, 13, 25, 18, 13, 19, 19, 15],
    "hwy": [ 23, 17, 12, 29, 28, 27, 24, 31, 27, 17, 26, 27, 31, 17, 36, 24, 17, 28, 29, 22],
    "fl": [ "r", "r", "e", "r", "r", "p", "r", "r", "r", "r", "p", "p", "r", "r", "r", "r", "r", "p", "r", "r"],
    "class": [ "compact", "pickup", "suv", "compact", "subcompact", "compact", "subcompact", "midsize", "compact", "suv", "midsize", "midsize", "midsize", "pickup", "subcompact", "minivan", "pickup", "midsize", "subcompact", "subcompact"]
  },
  "mapping": {
    "x": "displ",
    "y": "hwy"
  },
  "kind": "plot",
  "scales": [{"aesthetic": "color", "discrete": true}],
  "layers": [
    {
      "geom": "point",
      "mapping": {
        "color": "cyl"
      }
    },
    {
      "geom": "smooth",
      "mapping": {
        "color": "cyl",
        "group": "cyl"
      },
      "method": "lm",
      "deg": 2,
      "size": 1
    }
  ]
}
"""

[alshan]

This was fixed.