Disconnect _cell_changed signal on edit abort

app/playlists.py

@@ -383,6 +383,13 @@ class PlaylistTab(QTableWidget):
         play controls and update display.
         """
 
+        # If edit was cancelled (eg, by pressing ESC), the signal will
+        # still be connected
+        try:
+            self.cellChanged.disconnect(self._cell_changed)
+        except TypeError:
+            pass
+
         self.edit_cell_type = None
         self.musicmuster.enable_play_next_controls()
         self.musicmuster.actionSetNext.setEnabled(True)