Steps to reproduce

1. Create a user containing the á character (mine is simply called á without any other characters)
2. Log out and attempt to log in as that user

Expected behaviour

I should be logged in successfully

Actual behaviour

I am shown the error message

mysqli_real_connect(): (28000/1045): Access denied for user 'á'@'localhost' (using password: YES)

Server configuration

Operating system:
Debian Linux
Web server:
Apache 2.4.10
Database:
MySQL 5.5.49
PHP version:
5.6.20
phpMyAdmin version:
4.7.0-dev; git revision 5a4af02
Client library
libmysql - 5.5.49

Client configuration

Browser:
Firefox 46.0.2
Operating system:
Mac OS X