Update database correctly when tabs are closed

app/models.py

@@ -2,7 +2,7 @@
 
 import os.path
 import re
-import stackprinter
+import stackprinter                         # type: ignore
 
 from dbconfig import Session
 
@@ -263,8 +263,17 @@ class Playlists(Base):
     def close(self, session: Session) -> None:
         """Mark playlist as unloaded"""
 
+        # Closing this tab will mean all higher-number tabs have moved
+        # down by one
+        closed_idx = self.tab
         self.tab = None
 
+        session.execute(
+            update(Playlists)
+            .where(Playlists.tab > closed_idx)
+            .values(tab=Playlists.tab - 1)
+        )
+
     @classmethod
     def create_playlist_from_template(cls,
                                       session: Session,

app/musicmuster.py

@@ -358,7 +358,7 @@ class Window(QMainWindow, Ui_MainWindow):
 
     def close_tab(self, tab_index: int) -> None:
         """
-        Close active playlist tab unless it holds the curren or next track.
+        Close playlist tab unless it holds the current or next track.
         Called from close_playlist_tab() or by clicking close button on tab.
         """
 
@@ -375,6 +375,12 @@ class Window(QMainWindow, Ui_MainWindow):
                 "Can't close next track playlist", 5000)
             return
 
+        # Record playlist as closed and update remaining playlist tabs
+        with Session() as session:
+            playlist_id = self.tabPlaylist.widget(tab_index).playlist_id
+            playlist = session.get(Playlists, playlist_id)
+            playlist.close(session)
+
         # Close playlist and remove tab
         self.tabPlaylist.widget(tab_index).close()
         self.tabPlaylist.removeTab(tab_index)
@@ -420,8 +426,7 @@ class Window(QMainWindow, Ui_MainWindow):
         self.btnStop.clicked.connect(self.stop)
         self.hdrCurrentTrack.clicked.connect(self.show_current)
         self.hdrNextTrack.clicked.connect(self.show_next)
-        self.tabPlaylist.currentChanged.connect(
-            lambda: self.tabPlaylist.currentWidget().tab_visible())
+        self.tabPlaylist.currentChanged.connect(self.tab_change)
         self.tabPlaylist.tabCloseRequested.connect(self.close_tab)
         self.tabBar = self.tabPlaylist.tabBar()
         self.tabBar.tabMoved.connect(self.move_tab)
@@ -1207,6 +1212,15 @@ class Window(QMainWindow, Ui_MainWindow):
         # Run end-of-track actions
         self.end_of_track_actions()
 
+    def tab_change(self):
+        """Called when active tab changed"""
+
+        try:
+            self.tabPlaylist.currentWidget().tab_visible()
+        except AttributeError:
+            # May also be called when last tab is closed
+            pass
+
     def this_is_the_next_track(self, session: Session,
                                playlist_tab: PlaylistTab,
                                track: Tracks) -> None:

app/playlists.py

@@ -203,16 +203,6 @@ class PlaylistTab(QTableWidget):
 
 # ########## Events other than cell editing ##########
 
-    def closeEvent(self, event) -> None:
-        """Handle closing playist tab"""
-
-        with Session() as session:
-            # Record playlist as closed
-            playlist = session.get(Playlists, self.playlist_id)
-            playlist.close(session)
-
-        event.accept()
-
     def dropEvent(self, event: QDropEvent) -> None:
         """
         Handle drag/drop of rows