[comp:IxCollapse] 设置 borderless 后，嵌套使用的 IxCollapse 边框消失

[imguolao]

Reproduction link

无

Steps to reproduce

IxCollapse 在嵌套使用时，外部 IxCollapse 的 bordless 会影响内部 IxCollapse 的样式

<template>
  <IxCollapse borderless>
    <IxCollapsePanel key="1" header="标题">
      <IxCollapse>
        <IxCollapsePanel key="1" header="标题">
          <span>内容区</span>
        </IxCollapsePanel>
      </IxCollapse>
    </IxCollapsePanel>
  </IxCollapse>
</template>

What is expected?

嵌套使用时，外部无边框，内部有边框，borderless 仅对当前组件生效。

What is actually happening?

设置 borderless 后，嵌套使用的 IxCollapse 都没有边框。

Any additional comments? (optional)

---

Environment	Info
@idux
Browser

[idux-bot[bot]]

Translation of this issue:

[comp:]

reproduction link

none

steps to reproduce

Ixcollapse in nest, exterior_ ixcollapse to affect interiorXcollapse

<template>
  <IxCollapse borderless>
    <IxCollapsePanel key="1" header="标题">
      <IxCollapse>
        <IxCollapsePanel key="1" header="标题">
          <span>内容区</span>
        </IxCollapsePanel>
      </IxCollapse>
    </IxCollapsePanel>
  </IxCollapse>
</template>

What is expected?

Nesting, external boundless box, interior, borderless only take effect on the current component.

What is actually happens?

SetBorderless More images used in nested `ixcollapse. None borders.

ANY Additional Comments? (Optional)

---

ENVIRONMENT	INFO
@IDUX
Browser

[imguolao]

vue2 的 idux 才有此 bug，vue3 么有。