Username uniqueness validation should be case insensitive for usernames from different tenants

Preconditions:

1. Central tenant and member tenant exist

1. User A has been created in Central tenant with "Staff" user type and has NO assigned affiliations. Important! User A username contains both uppercase and lowercase characters

1. User B has been created in member tenant with "Staff" user type

1. Authorized User B is logged in member tenant with the following permissions:

• Users: Can create and edit users

• Users: Can edit user profile

Steps to reproduce:

1. Go to "Users" app

2. Click "Actions" button on "User search results" pane and select "New" option

3. Fill the following fields:

•  

  • "Last name" - enter any value (e.g. "Test")

  • "Patron group" - select any value from the dropdown

  • "User type" - select "Staff" value from the dropdown

  • "Username" - enter User A username in lowercase

  • "Email" - enter existing email

1. Click "Save & close" button on "Create User" page

Expected result: 

• Error toast message "This username already exists" appears

• User was not saved