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e89075c112
Fixes https://github.com/flutter/flutter/issues/175950. This PR is to make screen reader announce the text field content and the trailing button together on `DropdownMenu`. When the `DropdownMenu` cannot be focused (`canRequestFocus()` is set to false), the "text field" should be treated as if it is a button, and the trailing button should **not** be announced separately. When the text field is focusable, it's reasonable to separate text field and the trailing button, so I leave it as is. The native app doesn't announce "expanded"/"collapsed", so I use `Semantics.hint` to achieve the goal. This demo is to show the screen reader announcement. https://github.com/user-attachments/assets/e7a9da8f-acf8-4018-a778-1ded1b07103c ## 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.