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[win32] Implement hot restart for multi-window - #193225
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This pull request introduces OnPreEngineRestart to handle window destruction during hot restarts without dispatching messages to the isolate, refactors window destruction logic in OnEngineShutdown and HandleMessage, and adds corresponding unit tests. Feedback suggests addressing a potential infinite loop risk in OnEngineShutdown if window destruction fails, and adding a null check for the Flutter view window handle in HandleMessage to prevent calling Windows API functions with a null handle.
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This was referenced Sep 24, 2026
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This PR implements hot restart for multi-window and fixes a introduces a more robust solution for delaying the FlutterView HWND destruction.
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