Qixing Cao db8ed65398 [Windows] handle repaint message in FlutterView window (flutter/engine#34306)
This PR will fix the blank FlutterView issue by handling the repaint message in FlutterView window.

Currently, WM_PAINT msg is not handled in flutter window and the default WindowProc will do nothing but paint the background. In some user cases, e.g., hide/show/min/max the app window, this can result in blank FlutterView if the content is static and there are no running animation.

Addresses https://github.com/flutter/flutter/issues/101339
Addresses https://github.com/flutter/flutter/issues/102030
2022-07-13 11:15:28 -07:00
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