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Screens with no tree

Where the accessibility tree runs out, and why saying so beats returning a screen that merely looks empty.

  • Some screens have no tree to capture at any price. A Flutter view is one canvas with no accessible children, and web content is a second tree behind a context switch this stack has none of. The digest carries a note saying so and naming ios_screenshot, because the alternative is a screen that merely looks empty. See docs/adr/0007.