Seeing that the value and text of the Select element can be different. I would say if, in case the line contained in your text selection is longer than X, it truncates it.
Jquery example
$('#myselect option').each(function() { var myStr = $(this).text(); if(myStr.length > 15){$(this).text(myStr.substring(15));} });
put this in your document and it will crop your text to a higher size, wrapping your elements in a div that will hide the overflow, later will do something messy, and you will return here trying to solve a similar problem caused by smaller lines.
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