紧凑树等树图折叠时希望可以有不同颜色等标志表示该节点是折叠收起状态 #3388

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What problem does this feature solve?

默认的紧凑树等树图折叠时希望可以有不同颜色等标志表示该节点是折叠收起状态，而不用group.addShape自定义来实现

What does the proposed API look like?

如下图实现效果：

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