WIP V3: marn new playlist as open

app/musicmuster.py

@@ -564,7 +564,11 @@ class Window(QMainWindow, Ui_MainWindow):
             return None
         playlist = Playlists(session, playlist_name)
 
-        return playlist
+        if playlist:
+            playlist.mark_open()
+            return playlist
+
+        return None
 
     def create_and_show_playlist(self) -> None:
         """Create new playlist and display it"""