Fix playlist name display and playlist selection (fix #490)

VocaluxeLib/Menu/CMenuPartySongSelection.cs

@@ -100,6 +100,8 @@ namespace VocaluxeLib.Menu
         protected int NumMinMedleySongs = 3;
         protected int NumMaxMedleySongs = 10;
 
+        private List<int> _PlaylistIDs;
+
         public override void Init()
         {
             base.Init();
@@ -188,6 +190,8 @@ namespace VocaluxeLib.Menu
                 _SelectSlides[_SelectSlideSorting].AddValue(ss.ToString());
 
             _SelectSlides[_SelectSlidePlaylist].Clear();
+            _SelectSlides[_SelectSlidePlaylist].NumVisible = 1;  // Make sure that only one playlist at a time will be displayed (or the names overlap)
+            _PlaylistIDs = CBase.Playlist.GetIds();
             List<string> playlists = CBase.Playlist.GetNames();
             for (int i = 0; i < playlists.Count; i++)
             {
@@ -220,7 +224,7 @@ namespace VocaluxeLib.Menu
             _SongMode = _SelectSlides[_SelectSlideSongMode].Selection;
             _Source = _SelectSlides[_SelectSlideSource].Selection;
             NumMedleySongs = NumMinMedleySongs + _SelectSlides[_SelectSlideNumMedleySongs].Selection;
-            Playlist = _SelectSlides[_SelectSlidePlaylist].Selection;
+            Playlist = _PlaylistIDs[_SelectSlides[_SelectSlidePlaylist].Selection];
 
             if (_SelectSlides[_SelectSlideSorting].Selection != _Sorting)
             {