According to http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-5.html, starting with MySQL 5.7.5, support for pre-4.1 password hashing is removed. In phpMyAdmin 4.3 we should verify whether MySQL is 5.7.5 or later and if so, remove the password hashing choice in the password change dialog.
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