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Demos include a 'Dismiss' semantics object when not needed
A side-effect of https://github.com/flutter/gallery/commit/63eb33e62c9847716119cfb9c6594166ec835304 is that all demo pages now includes a Semantics object to dismiss an open menu, even when that menu is closed.
This should be fixed, while still retaining demo state (conditionally inserting a Semantics widget caused a rebuild that lost demo state)