Tree组件选择取消node问题

[beenqi]

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

What problem does this feature solve?

组件点击某个node会选中、再次点击会取消选中；现在需要禁止取消事件，即总存在一个选中项、再次点击取消事件不生效

What does the proposed API look like?

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[zkwolf]

你可以自己想办法先控制一下数据实现这个需求

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.