refactor stream_with_context for async views #5799
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−32
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Store the app context as well as the request context when creating the generator. This prevents the request context from automatically creating and pushing a different app context. Then push the app context first, and push them only when iteration starts, not during setup. This prevents the request context from automatically popping the app context, and avoids associating the internal ContextVar with the temporary event loop in async views.
fixes #5774