On mobile screens (iphone 5/se, for example) after attachment some file (in issue edit form, for example) description field cropped. Also, after entering a few characters in description field side menu starts to come out.

To fix it enough:

1. change file /public/javascripts/attachments.js line 63

   From:
   fileSpan.find('input.description, a').css('display', 'inline-block');
   To:
   fileSpan.find('input.description, a').css('display', $(window).width() < 899 ? 'block' : 'inline-block');

2. Also need add lines to /public/stylesheets/application.css

   @media screen and (max-width: 400px) {
   .attachments_fields input.description, #existing-attachments input.description { width:280px; }
   }