Update Edge's style will break default Edge's KeyShape 更新边样式会破坏默认边缘的形状
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bug
- Dominant language
- TypeScript
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Description
**Describe the bug**
更新了边的样式之后，`edge._cfg.keyShape.attrs.lineAppendWidth` 会变成 0，导致用户单击边的时候产生困难
**To Reproduce**
附上沙包： https://codesandbox.io/s/vibrant-thunder-tcev6?file=/App.tsx
1. 单击 [Update Edge]
2. 打开 console 查看 `edge._cfg.keyShape.attrs.lineAppendWidth` 的值
**Expected behavior**
更新了边的样式之后，`edge._cfg.keyShape.attrs.lineAppendWidth` 的数值需和默认值一样。
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