This way browsing in a popup dialog containing a listbox will always show first listbox items (usefull when for example last page is only few rows then going to it leaves user with nothing forcing him to scroll manually up).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44553 20353a03-c40f-0410-a6d1-a30d3c3de9de