[PyQt] Cancelling QtWebEngine authentication with PyQt

[Florian Bruhin]

Hi,

QtWebEngine requires setting the passed QAuthentication pointer to an
empty QAuthenticator to cancel authentication
("*authenticator = QAuthenticator();" in authenticationRequired), see
the note here:

http://doc-snapshots.qt.io/qt5-5.7/qtwebenginewidgets-qtwebkitportingguide.html#qt-webengine-does-not-interact-with-qnetworkaccessmanager

Unfortunately I can't see a way to do this from PyQt, apart from
using setHtml to display some error (which seems a bit hacky to me):

https://github.com/kovidgoyal/vise/commit/749a9c693e4107c073a90042b079dc658ad73564

Not sure what the best way to solve this would be though...

Florian

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