Add login hint support for GitHub browser-based OAuth authentication #1137
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If a username is specified in the remote URL then include this as a login hint when performing OAuth authentication for GitHub. This can help users of multiple accounts select the correct account before the OAuth flow completes and returns a token for the wrong account.
GitHub shows this nice prompt when a login hint is provided that does not match the currently logged-in user:
At the same time, if there is no logged-in user, then the login page's username box is already filled in:
The login hint is specified to GitHub via the extra
login
query parameter to the authorization endpoint.