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## Description When a DropdownMenu exists within another menu and a MenuItem is selected, the `TextEditingController` of the DropdownMenu is used after it has been disposed. This PR manages the local `TextController` instance better, making sure that the one used when building is the current one, and handling the case where the `controller` is set on the widget after initial creation. Also, places where we were setting the text and selection separately were converted to use `TextEditingValue` and set the value atomically. ## Related Issues - Fixes https://github.com/flutter/flutter/issues/139266 ## Tests - Added tests (Created by @josh-burton in https://github.com/flutter/flutter/pull/139268 - Thanks Josh!)