cursor offscreen and from a page other than the first one onto a
different page by reverting the erroneous change to edit_scroll() and
adding the proper fix to edit_redraw()


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3263 35c25a1d-7b9e-4130-9fde-d3aeb78583b8