fix: unexpected ScrollNotification #856
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我看这个情况只在TabBarViewPage的示例中出现，应该跟嵌套滚动有关 |
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如下视频所示，点击
Grid，往上滑动一段距离，再点击返回按钮，控制台会有NotificationListener的相应输出111.mov
经调试发现因
(oldMaxScrollExtent != position.maxScrollExtent && position.maxScrollExtent != 0)成立，返回的simulation不为null而导致。所以我将原来修复 #618 的代码进行了调整，仅在
header或footer指示器的状态为非inactive时才做相关比较