Pull Request for Issue # #32895

Summary of Changes

After attempting to login with invalid credentials, you are not redirected back to the login page, so pressing refresh actually attempts to send the POST request a second time.

Administrator login form doesn't follow Post/Redirect/Get pattern

(also a quick typo fix in comment)

Testing Instructions

Attempt to login to Joomla 4 with invalid credentials.
Inspect the requests/responses with browser inspector tools

Actual result BEFORE applying this Pull Request

Request: POST of invalid credentials
Response: HTML with error message, if you refresh the page the browser asks to resend the form

Expected result AFTER applying this Pull Request

Request: POST of invalid credentials
Response: 303 Other redirect to /administrator/index.php
browser follows redirect (not always shown in the inspector on some browsers, look hard, it fooled me too)
Response: GET /administrator/index.php, if you refresh the page the browser just performs a refresh (GET) and validation message is missing as its already displayed

Documentation Changes Required

none