[Bug Report] el-collapse

[yubei61200]

Element UI version

2.0.11

OS/Browsers version

windows/chrome

Vue version

2.5.13

Reproduction Link

https://jsfiddle.net/yubei61200/0rva0990/

Steps to reproduce

当外层的el-collapse处于打开状态时，内层的el-collapse未打开时也会显示向下的箭头

What is Expected?

当外层的el-collapse处于打开状态时，内层的el-collapse未打开时显示向右的箭头

What is actually happening?

当外层的el-collapse处于打开状态时，内层的el-collapse未打开时也会显示向下的箭头

[element-bot]

Translation of this issue:

Element UI version

2.0.11

OS/Browsers version

Windows/chrome

Vue version

2.5.13

Reproduction Link

https://jsfiddle.net/yubei61200/0rva0990/

Steps to reproduce

When the el-collapse of the outer layer is in the open state, the downward arrow is displayed when the el-collapse is not opened.

What is Expected?

When the el-collapse of the outer layer is in the open state, the arrow to the right is displayed when the el-collapse is not opened.

What is actually happening?

When the el-collapse of the outer layer is in the open state, the downward arrow is displayed when the el-collapse is not opened.

[singone]

嗨，此pr会造成另一个问题。

当需要针对展开的样式进行修改样式的时候，会出现问题。