SSPI logins don't redirect away from sign-in page

[Craig-Holmquist-NTI]

Description

With 1.21.5, after logging in through SSPI, the login succeeds, but the user remains on the sign-in page instead of redirecting to the home page.

Gitea Version

1.21.5

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

Before logging in:

Immediately after logging in with SSPI:

Screenshots are from Edge 121 but happens with multiple browsers.

Git Version

2.39.1

Operating System

Windows Server 2019

How are you running Gitea?

gitea-1.21.5-windows-4.0-amd64.exe downloaded from Github.

Database

SQLite

[wxiaoguang]

I think it is related to #26105 . After that change, if the user has signed in, then "/user/login" should also redirect.

[wxiaoguang]

After this fix: Make "/user/login" page redirect if the current user has signed in #29583 , maybe this problem could be resolved.