[comp：table ]树表格展示都是同级，没有体现父子关系

[calvinchan22]

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

直接在idux官网即可复现

Steps to reproduce

树表格展示都是同级，没有体现父子关系

What is expected?

希望能够一眼看出父子关系

What is actually happening?

都是同级的，无法区分

Environment Info

Any additional comments? (optional)

[idux-bot]

Translation of this issue:

[Comp: Table] The display of the tree tables is the same level, and the relationship between father and son is not reflected

• [] I have searched the [isSues] (https://github.com/iduxfe/idux/issues) of this repository that this is not a duplicate.

REPRODUCTION LINK

You can reproduce directly on the IDUX official website

STEPS To Reproduce

The display of the tree table is the same level, and the relationship between father and son is not reflected

What is exfected?

Hope to see the relationship between father and son at a glance

What is actually happy?

They are all at the same level and cannot be distinguished

ENVIRONMENT Info

ANY Additional Comments? (Optional)