[desktop_multi_window] bug: mac NSWindow delegate conflict #431
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[desktop_multi_window]
bug fix: mac NSWindow delegate conflict,
To prevent the flutter engine from being shut down after the NSWindow delegate is reset by other components (such as window_manager), shut down the flutter engine first when shutting down.
if deletegate can't call back in desktop_multi_window,
flutter widget will use
to close flutter engin