PlaylistManager: Remove unused InvalidateDeletedSongs function

src/playlist/playlistmanager.cpp

@@ -525,15 +525,6 @@ void PlaylistManager::RemoveCurrentSong() const {
   active()->removeRows(active()->current_index().row(), 1);
 }
 
-void PlaylistManager::InvalidateDeletedSongs() {
-
-  const QList<Playlist*> playlists = GetAllPlaylists();
-  for (Playlist *playlist : playlists) {
-    playlist->InvalidateDeletedSongs();
-  }
-
-}
-
 void PlaylistManager::RemoveDeletedSongs() {
 
   const QList<Playlist*> playlists = GetAllPlaylists();

src/playlist/playlistmanager.h

@@ -74,8 +74,6 @@ class PlaylistManager : public PlaylistManagerInterface {
 
   // Returns the collection of playlists managed by this PlaylistManager.
   QList<Playlist*> GetAllPlaylists() const override;
-  // Grays out and reloads all deleted songs in all playlists.
-  void InvalidateDeletedSongs() override;
   // Removes all deleted songs from all playlists.
   void RemoveDeletedSongs() override;
   // Returns true if the playlist is open

src/playlist/playlistmanagerinterface.h

@@ -59,8 +59,6 @@ class PlaylistManagerInterface : public QObject {
 
   // Returns the collection of playlists managed by this PlaylistManager.
   virtual QList<Playlist*> GetAllPlaylists() const = 0;
-  // Grays out and reloads all deleted songs in all playlists.
-  virtual void InvalidateDeletedSongs() = 0;
   // Removes all deleted songs from all playlists.
   virtual void RemoveDeletedSongs() = 0;