[macOS] Plugin paincs when calling ns_view.window() in Window::open_parented

[JouderMin]

I am working on a fork of nih-plug-webview, trying to make recent version of wry work with baseview.

But when I try to construct a window handler by wry::WebViewBuilder::build_as_child in baseview::Window::open_parented, the plugin panics!

Through the panic logs, I found wry will call ns_view.window().unwrap(), and it is where the plugin panics.