ncurses: only append to PL or ML
ncurses: only append to PL or ML

User interfaces should only add new items under the playlist or the
media library nodes. In particular, they have no business adding or
removing SD items.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc