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Fixes https://github.com/flutter/flutter/issues/3493 - rebuild stateless widgets that have dependencies when their ancestors change but they don't Fixes https://github.com/flutter/flutter/issues/3120 - rebuild widgets that tried to inherit from a widget that didn't exist, when the widget is added This adds a pointer and a bool to Element, which isn't great. It also adds a more or less complete tree walk when you add a new Inherited widget at the top of your tree, which isn't cheap.