By catch on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Issue links: 
https://www.drupal.org/node/3410582
Description: 

UserLoginForm::validateName() is deprecated because it has been merged into UserLoginForm::validateAuthentication() and will be removed in 12.0.0.

If you were overriding the user login form and explicitly referencing ::validateName(), remove any references to this method and ensure that the login code flow calls ::validateAuthentication() instead. If code does not explicitly reference ::validateName() it should be unaffected by this change.

Impacts: 
Module developers