Further fixes to moving tracks between playlists

Fixes: #38

app/model.py

@@ -338,6 +338,7 @@ class PlaylistTracks(Base):
                 f"PlaylistTracks.playlist_id == {from_playlist_id}, "
                 f"PlaylistTracks.row == {row}"
             )
+            return
         record.playlist_id = to_playlist_id
         record.row = new_row
         session.commit()

app/playlists.py

@@ -423,6 +423,9 @@ class PlaylistTab(QTableWidget):
         # on its specified row, only that it will be above
         # larger-numbered row items, and below lower-numbered ones.
 
+        # That means we need to re-save ourself once loaded to ensure
+        # database is correct.
+
         # First, save our id for the future
         self.id = playlist_db.id
         self.name = playlist_db.name
@@ -449,6 +452,7 @@ class PlaylistTab(QTableWidget):
         scroll_to = self.item(0, self.COL_INDEX)
         self.scrollToItem(scroll_to, QAbstractItemView.PositionAtTop)
 
+        self._save_playlist(session)
         self._repaint()
 
     def repaint(self):