always works consistently, per Benno Schulenberg's patch (with a few
tweaks of mine); also, blank the statusbar after 26 keystrokes instead
of 25, for compatibility with Pico


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3541 35c25a1d-7b9e-4130-9fde-d3aeb78583b8