scenario where using findAncestorWidgetOfExactType() will lead to failure to rebuild

[Kent Tong]

Hi,

I understand using an InheritedWidget is recommended over findAncestorWidgetOfExactType() when a widget depends on an ancestor widget. However, I can't think of a scenario where findAncestorWidgetOfExactType() will lead to failure to rebuild. If as a widget is read-only, the only way it changes is when it is replaced by a new one. Then the whole subtree will be rebuilt and so the descendant widget will be replaced by a new one  and its element will be updated. Am I missing something?

Thanks in advance!