Multi-category sorting misbehaves with missing categories

Originally reported in https://github.com/plotly/plotly.py/issues/1491.

There seems to a multi-category sorting bug that wasn't fixed by #3362.

CodePen: https://codepen.io/jonmmease/pen/VNeEqq?editors=1010

var fig = {
  "data": [
    {
      "name": "Fruits",
      "type": "bar",
      "x": [
        [
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2018,
          2018,
          2018,
          2018
        ],
        [
          4,
          5,
          6,
          8,
          9,
          10,
          11,
          12,
          1,
          2,
          3,
          4
        ]
      ],
      "y": [
        57246.0,
        1587.0,
        63189.0,
        30680.0,
        26071.0,
        117519.0,
        27519.0,
        42643.0,
        8559.0,
        22355.0,
        59363.0,
        62955.0
      ]
    },
    {
      "name": "Price",
      "type": "scatter",
      "x": [
        [
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2017,
          2018,
          2018,
          2018,
          2018
        ],
        [
          4,
          5,
          6,
          8,
          9,
          10,
          11,
          12,
          1,
          2,
          3,
          4
        ]
      ],
      "y": [
        0.22991999,
        0.27284184,
        0.18438336,
        0.24866362,
        0.18280848,
        0.19382398,
        0.17268069,
        0.18802617,
        0.17560463,
        0.13415343,
        0.14773512,
        0.31319196
      ],
      "yaxis": "y2"
    }
  ],
  "layout": {
    "height": 600,
    "showlegend": true,
    "yaxis": {
      "showgrid": true,
      "title": {
        "text": "Fruits volume"
      }
    },
    "yaxis2": {
      "anchor": "x",
      "overlaying": "y",
      "showgrid": false,
      "side": "right",
      "title": {
        "text": "Price per unit"
      }
    }
  }
}

Plotly.newPlot('myDiv', fig, {showSendToCloud: true});

The problem is that in the second multi-category (2018), the 4 is sorted before 1, 2, 3 even though they are specified in ascending sorted order.

As noted in https://github.com/plotly/plotly.py/issues/1491, this seems to happen for categories that are not present in the first multi-category (2017).

提供されたCodePenの例とPlotly.newPlotの設定を使用して挙動を再現し、カテゴリが後のグループにのみ存在する場合の複数カテゴリ軸の並べ替えに焦点を当てます。表示された順序を指定された昇順と比較します。完了条件は、2つ目の複数カテゴリが1, 2, 3, 4の順に並べ替えられ、例で報告されている挙動が維持されることです。