Added playing song view. Adding styling to playing song. Fixed caching cancellation issue.

Harmonia.WinUI/ViewModels/PlaylistViewModel.cs

@@ -6,9 +6,9 @@ using Harmonia.Core.Playlists;
 using Harmonia.Core.Scanner;
 using Harmonia.WinUI.Caching;
 using Harmonia.WinUI.Storage;
-using Microsoft.UI.Dispatching;
 using Microsoft.UI.Xaml.Media.Imaging;
 using System;
+using System.Collections;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -20,8 +20,8 @@ using System.Threading;
 using System.Threading.Tasks;
 using System.Timers;
 using System.Windows.Input;
+using Windows.ApplicationModel.Contacts;
 using Windows.ApplicationModel.DataTransfer;
-using Windows.System;
 using DispatcherQueue = Microsoft.UI.Dispatching.DispatcherQueue;
 using Timer = System.Timers.Timer;
 
@@ -288,7 +288,38 @@ public partial class PlaylistViewModel : ViewModelBase
             return;
 
         List<PlaylistSong> filteredPlaylistSongs = [.. Playlist.Songs.Where(playlistSong => IsFiltered(playlistSong.Song))];
-        FilteredPlaylistSongs = [.. filteredPlaylistSongs];
+        //FilteredPlaylistSongs = [.. filteredPlaylistSongs];
+
+        for (int i = FilteredPlaylistSongs.Count -1; i >= 0; i--)
+        {
+            PlaylistSong playlistSong = FilteredPlaylistSongs[i];
+
+            bool inPlaylist = Playlist.Songs.Contains(playlistSong);
+            bool inFilter = filteredPlaylistSongs.Contains(playlistSong);
+
+            if (!inPlaylist || !inFilter)
+            {
+                FilteredPlaylistSongs.Remove(playlistSong);
+            }
+        }
+
+        int insertionIndex = 0;
+
+        foreach (PlaylistSong playlistSong in Playlist.Songs)
+        {
+            bool inFilter = filteredPlaylistSongs.Contains(playlistSong);
+            bool inCurrentFilteredList = FilteredPlaylistSongs.Contains(playlistSong);
+
+            if (inFilter)
+            {
+                if (!inCurrentFilteredList)
+                {
+                    FilteredPlaylistSongs.Insert(insertionIndex, playlistSong);
+                }
+
+                insertionIndex++;
+            }
+        }
     }
 
     private bool IsFiltered(Song song)