[Feature] scrollbar 宽度占用空间优化

[xxxace]

What problem does this feature solve?

theme: {
    scrollStyle: {
      scrollRailColor: 'RGBA(216,216,216,.5)',
      visible: 'always',
      width: 16,
      hoverOn: false,
      barToSide: true,
      scrollSliderCornerRadius: 0,
      scrollSliderColor: 'RGBA(170,170,170,1)',
    }
}

当hoverOn: false时，高度够的情况下，scrollbar是隐藏的（正常），但是scrollbar的宽度依然占用（不正常）

当hoverOn: true时, 出现的scrollbar会遮挡住内容

What does the proposed API look like?

个人认为无需修改api,只需在渲染时对scrollbar的宽度和布局进行优化

非常感谢

[fangsmile]

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[xxxace]

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