tweak do_wrap(), remove_magicline(), edit_scroll(), and edit_update() to
rely on fileage and filebot instead of NULL for their checks to detect
the top or bottom of the file


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3143 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
4 files changed