fix(dual): set series of line to band scale

[pearmini]

折柱双轴图

• fix: 【v5】 同时存在 Interval transform:[{ type: 'dodgeX' }] 和 Line encode('color') 时，出现冲突 #5523
• fix: 【v5】柱线混合，前一个 mark 的 dodgeX tranform 会影响后一个的 Mark #5250

存在问题

line 和 area series 的比例尺是 identity，但是 interval 的比例尺是 band，同时存在比例尺会冲突。

解决办法

设置 line 和 area series 的比例尺类型也是 band，因为这个通道时用来分组的，只要保证映射结果不同即可，而 band 比例尺其实也满足这个特性。

结果

import { G2Spec } from '../../../src';

export function mockIntervalLine(): G2Spec {
  return {
    type: 'view',
    children: [
      {
        type: 'interval',
        data: [
          { time: '2019-03', value: 350, type: 'uv' },
          { time: '2019-04', value: 900, type: 'uv' },
          { time: '2019-05', value: 300, type: 'uv' },
          { time: '2019-06', value: 450, type: 'uv' },
          { time: '2019-07', value: 470, type: 'uv' },
          { time: '2019-03', value: 220, type: 'bill' },
          { time: '2019-04', value: 300, type: 'bill' },
          { time: '2019-05', value: 250, type: 'bill' },
          { time: '2019-06', value: 220, type: 'bill' },
          { time: '2019-07', value: 362, type: 'bill' },
        ],
        encode: { x: 'time', y: 'value', color: 'type' },
        transform: [{ type: 'dodgeX' }],
        axis: { y: { labelFormatter: '.0%' } },
      },
      {
        type: 'line',
        data: [
          { time: '2019-03', count: 800 },
          { time: '2019-04', count: 600 },
          { time: '2019-05', count: 400 },
          { time: '2019-06', count: 380 },
          { time: '2019-07', count: 220 },
        ],
        encode: { x: 'time', y: 'count', color: () => 'line' },
        axis: { y: { labelFormatter: '.0%' } },
      },
    ],
  };
}

[coveralls]

Pull Request Test Coverage Report for Build 6145717993

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 88.476%

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Totals
Change from base Build 6144031489:	-0.003%
Covered Lines:	9850
Relevant Lines:	10777

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💛 - Coveralls