in do_uncut_text(), maintain current_y's value when uncutting blocks so
David Lawrence Ramsey authored
that smooth scrolling works correctly; also add a few miscellaneous
cleanups


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2075 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
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