Add call to beginBackgroundTaskWithExpirationHandler before presenting authorization request #415
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Fixes #414
Description
Adding a call to beginBackgroundTaskWithExpirationHandler before presenting AsWebAuthenticationSession control so that if a network request is in progress in iOS13 and the app is put into the background, the network request is not killed right away. Background task will still be expired if takes too long or directly expired when the authentication session completes.
Steps to verify
See video links from bug report. With a long-running network request in AsWebAuthenticationSession put the app in the background and then resume. With this fix, the network request is still intact.