when you hit DEL key inside the playlist. Instead of the set becoming empty, forcing you to click or go up/down in the playlist window, it should instead leave the current selection marker at the end of the deleted set, so you could delete more entries from that location forth.
instead of the playlist itself.
Say you recursively added your entire collection of files, and later added or removed files from that collection - this menu command will update the playlist accordingly, by adding the new files at the bottom, and by removing dead files. This feature completes the 'Add Directory' action. The implementation adds a new field to the M3U playlsit file named '#EXTROOT:' that tells what is the path to which to look for new files. So, this feature will work on only new playlists, or playlists that you manually modified by adding this field.