Qun Cheng 58c5cbd17f Add Expanded/Collapsed state for SubmenuButton (flutter/engine#43983) ...

This PR is to add support for the expanded/collapsed-state semantics flag to the engine. After adding another PR to Flutter, we will be able to support the expanded/collapsed state in semantics for submenu buttons.

Related to [#127617](https://github.com/flutter/flutter/issues/127617) in flutter

2023-07-28 00:49:12 +00:00

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src/flutter

Add Expanded/Collapsed state for SubmenuButton (flutter/engine#43983)

2023-07-28 00:49:12 +00:00