如何在Stencil的节点中添加删除按钮，点击后删除对应节点？ #3985
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chenlong-io
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这个功能很有必要 |
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需求：用户可以在Stencil中点击删除按钮删除节点。
上图是在 官网示例 中添加了删除按钮(红框中的代码)
但鼠标移上去没有任何反应，按钮显示不出来，只有鼠标按下后才显示，但此时的节点处于可拖拽状态。
如何让鼠标移到 Stencil 中的节点上时，显示删除按钮，并点击可以删除节点。
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