The + and - icons in the Admin Treemenu have a href="#" in their links. So if you have a big expanded tree and click on a + or - icon you will always jump to the top of the page.

This behaviour could be easily avoided by replacing the href="#" with href="javascript:void(0)".

I think its only in line 158 in design/admin/templates/contentstructuremenu/content_structure_menu_dynamic.tpl

Replace

               + '" href="#" onclick="this.blur(); return treeMenu.load( this, '

by

                + '" href="javascript:void(0)" onclick="this.blur(); return treeMenu.load( this, '

Steps to reproduce

Expand the content tree in the normal Admininterface, scroll down a bit, click an icon to expand.