仪表盘里两个全局筛选器如何实现“双向同步联动”，又不会引发...

目前有两个下拉框筛选器：【区域】和【省份】。
业务需求是：如果用户选了“华南区”，省份下拉框里自动过滤出华南的省；如果用户先选了“广东省”，区域下拉框也自动变成“华南区”。
我在组件属性里尝试配了联动，但发现极其容易触发“循环刷新”——选A触发B更新，B更新又反过来触发A，导致页面疯狂转圈卡死。
请教一下各位高手，SmartBI的全局参数有没有类似前端防抖（Debounce）的机制？
或者在宏代码里，怎么设置一个标志位（Flag），在A执行更新B的时候，暂时屏蔽B的“OnChange”事件？求一份成熟的防死循环联动代码逻辑。

谢谢
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