generated from commit: 6948547d9bcec05d5cb0427f1d01c21500fe6c7f

Piotr Janik <janikpiotrek@gmail.com>
Mon Jun 3 21:28:54 2013 +0200

    Fix a bug in substitution mutation context menu

    [#41660503]

Dynamically added classes weren't removed correctly, so after a few
substitution mutations submenu elements were invisible.