Creates additional users when adding whitespaces to username

When using XWiki with the LDAP Authenticator extension, logging in as "<user>" creates the XWiki user "<user>".

However when logging in as " <user>" or "<user> " (leading/trailing whitespaces) an additional XWiki user "<user>_1", "<user>_2" etc. is created that maps to the same LDAP DN.

The user profiles look like this:
LDAP DN: "uid=<user>,..." (no whitespace)
LDAP user unique identifier: " <user>" (with whitespace)

Tested with:

• XWiki 8.4.4
• LDAP Authenticator 9.2.1
• OpenLDAP 2.4.40