EllisLab/CodeIgniter — pull request #578 by bmardock (2011-10-14 21:57:04+00:00)
Title: Update system/libraries/Pagination.php

when setting page_query_string = TRUE
create_links() function overwrites existing query string parameters
expected url:
/base_url/?filterBy=value&sortBy=desc&page=20
actual url:
/base_url/&page=20