[Feature Request] 树形控件节点之间增加虚线连接线的配置，true：开启，false：关闭，默认true
Open
stale
- Dominant language
- Vue
- Stars
- 54k
- Forks
- 14.4k
- PR merge metrics
- No merged PRs in 30d
Description
### Existing Component
是
### Component Name
el-tree
### Description
树形控件节点之间增加虚线连接线的配置，true：开启，false：关闭，默认true
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