Playlist fixes

- Fix bug resetting playlist view columns to show all when using more than one
playlist.
- Add queue to play next

src/playlist/playlistundocommands.cpp

@@ -36,17 +36,18 @@ namespace PlaylistUndoCommands {
 Base::Base(Playlist* playlist) : QUndoCommand(0), playlist_(playlist) {}
 
 
-InsertItems::InsertItems(Playlist *playlist, const PlaylistItemList &items, int pos, bool enqueue)
+InsertItems::InsertItems(Playlist *playlist, const PlaylistItemList &items, int pos, bool enqueue, bool enqueue_next)
   : Base(playlist),
     items_(items),
     pos_(pos),
-    enqueue_(enqueue)
+    enqueue_(enqueue),
+    enqueue_next_(enqueue_next)
 {
   setText(tr("add %n songs", "", items_.count()));
 }
 
 void InsertItems::redo() {
-  playlist_->InsertItemsWithoutUndo(items_, pos_, enqueue_);
+  playlist_->InsertItemsWithoutUndo(items_, pos_, enqueue_, enqueue_next_);
 }
 
 void InsertItems::undo() {