[5.x] Prevent double login causing 419 CSRF token mismatch #10465
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This fixes an issue where some people were seeing 419 errors after logging in.
We found that the reason was typically due to submitting the form twice.
Either by:
It seems that the first time the form is submitted, you get logged in and your csrf token is updated. Then if you click it a second time, the old token is submitted but no longer matches your current one, resulting in the error.
This PR fixes that issue by disabling the submit button while the form is submitting, preventing you from submitting twice.
This PR gives the same treatment to the reset password form which has the same issue.