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This PR is to wire up `MenuAnchor` related widgets to SemanticsRole. * When use `MenuAnchor` and a menu is opened, the menu has `SemanticsRole.menu`. * `MenuBar` has `SemanticsRole.menuBar` * `MenuItemButton` has `SemanticsRole.menuItem` * `SubmenuButton` has `SemanticsRole.menuItem` with `aria-haspopup` attribute setup. * `CheckboxMenuButton` has `SemanticsRole.menuItemCheckbox` * `RadioMenuButton` has `SemanticsRole.menuItemRadio` This PR also includes some changes related to `OverlayPortal` and `RawMenuAnchor` so the "button" and the "menu" that the button opens has a "parent-children" relationship. Previously, they are siblings relationship which will cause some navigation issue in a11y. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.
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