On Jan 27, 2014, at 9:57 AM, John Chilton <chilton@msi.umn.edu> wrote:

The swap over happens when
the number of items gets sufficiently large and a jQuery-based widget
called select2 replaces all select boxes in Galaxy - unless explicitly
disabled. I understand the desire to disable this. I am not sure
anyone is really very pleased with select2 for multiple select widgets
- it might be worth just disabling it for multiple select form
elements all together globally. I don't know.

The function 'replace_big_select_inputs' in galaxy.base.js is where the logic for this code is located. You could avoid applying select2 to selects with multiple using the following CSS selector on line 261 in place of $('select'):

$('select').not('[multiple]')

Best,
J.