AccessMixin: object HttpResponseRedirect can't be used in 'await' expression

[Johannes Maron]

The redirect response in AccessMixin.handle_no_permission isn't async compatible.

If you have access, everything works fine, since all HTTP method handlers are async and return coroutines; only if you lack permissions or are unauthenticated is the redirect response synchronous.

With access to view_is_async it should be a fairly easy fix to have handle_no_permission return a coroutine.

Thanks to @amirreza-sf80 for reporting:
​https://github.com/django/new-features/issues/162#issuecomment-4562082172

I could find the bug on Stack Overflow as well, but no ticket on Trac:
​https://stackoverflow.com/questions/66512353/using-loginrequiredmixin-with-async-views

[amirreza]

should mention LoginRequiredMixin also uses request.user.is_authenticated inside dispatch, but it should use auser instead,
which requires awaiting.