bash completion: master@{1}..mas<TAB> gives mastermaster@{1}..master
From: Johannes Sixt <hidden>
Date: 2016-06-15 22:44:59
If you hit TAB after 'master@{1}..mas' and 'mas' is unique, then it is
expanded to 'mastermaster@{1}..master'. If 'mas' is not unique, and you
continue hitting TAB, then the part before '@' is doubled with each TAB.
-- Hannes