properly overhaul edit_scroll() to update the screen on its own this
time, convert the vertical movement functions to use the new version of
it, and simplify them where possible


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2876 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
3 files changed