Sorry, I should have noticed the unbalanced parentheses instead of blindly replying with No.
I applied this new patch and as cou can see from my postgresql log, here after, lowercase user is still created:
< 2018-03-10 15:11:48.446 CET >LOG: exécute pdo_stmt_0000000b: insert into audit ( sessionId , auditDay , idUser , userName , platform , browser , browserVersion , userAgent , connectionDateTime , lastAccessDateTime , duration , idle , requestRefreshParam , requestRefreshProject , requestDisconnection ) values ('ftf51cb7qq86ms2cg6njhidrn2', '20180310', '3', '39471N', 'Windows', 'Mozilla Firefox', '58.0', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0', '2018-03-10 15:11:48', '2018-03-10 15:11:48', '00:00:00', '0', '0', '0', '0')
< 2018-03-10 15:12:24.119 CET >LOG: exécute pdo_stmt_0000000a: insert into resource (isuser, name , fullName , email , idProfile , locked , isContact , isResource , idle , dontReceiveTeamMails , isLdap , apiKey ) values ('1', '39471n', 'FATHI BEN NASR', 'Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.', '5', '0', '1', '1', '0', '0', '1', '08195scarmbled280')
< 2018-03-10 15:12:24.529 CET >LOG: exécute pdo_stmt_00000021: insert into mail ( idUser , mailDateTime , mailTo , mailStatus , idle , mailTitle , mailBody ) values ('12', '2018-03-10 15:12', 'Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.', 'WAIT', '0', 'ProjeQtOr - Nouvel utilisateur', 'L''utilisateur ''39471n'' a été créé à partir de Ldap')
< 2018-03-10 15:12:25.680 CET >LOG: exécute pdo_stmt_0000002c: insert into alert ( idUser , alertType , alertInitialDateTime , alertDateTime , readFlag , idle , title , message ) values ('1', 'INFO', '2018-03-10 15:12:25', '2018-03-10 15:12:25', '0', '0', 'ProjeQtOr - Nouvel utilisateur', 'L''utilisateur ''39471n'' a été créé à partir de Ldap')
< 2018-03-10 15:12:25.717 CET >LOG: exécute pdo_stmt_00000031: insert into audit ( sessionId , auditDay , idUser , userName , platform , browser , browserVersion , userAgent , connectionDateTime , lastAccessDateTime , duration , idle , requestRefreshParam , requestRefreshProject , requestDisconnection ) values ('6n3evcn5lmt5gcvgn186qom734', '20180310', '12', '39471n', 'Windows', 'Mozilla Firefox', '58.0', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0', '2018-03-10 15:12:25', '2018-03-10 15:12:25', '00:00:00', '0', '0', '0', '0')