Fixed #12

wobuzz/player/playlist.py

@@ -309,6 +309,9 @@ class Playlist:
         for view in self.views.values():  # close views (and PyQt automatically closes the corresponding tabs)
             view.deleteLater()
 
+        for track in self.tracks:  # remove items that corresponded to the track and this playlist
+            track.delete_items(self)
+
         self.app.utils.unique_names.remove(self.title)
         self.app.library.playlists.remove(self)
 

wobuzz/player/track.py

@@ -22,7 +22,7 @@ class Track:
         self.duration = 0
 
         self.items = []
-        self.occurrences = {}  # all occurrences in playlists categorized by playlist and track widget
+        self.occurrences = {}  # all occurrences in playlists categorized by playlist and id of the track widget
 
         if cache:
             self.cache()
@@ -94,3 +94,14 @@ class Track:
 
         # return the remaining part of the track's audio and the duration of the remaining part
         return sound, len(remaining_audio)
+
+    def delete_items(self, playlist):
+        """
+        Deletes all QTreeWidgetItems that correspond to this track and the given playlist.
+        """
+
+        for item in self.items:
+            if id(item) in self.occurrences[playlist]:
+                self.items.remove(item)
+
+        self.occurrences.pop(playlist)