Move the tabbar destroy logic into the tab bar class

kitty/boss.py

@@ -263,11 +263,10 @@ class Boss:
         self.child_monitor.shutdown()
         wakeup()
         self.child_monitor.join()
-        for t in self.tab_manager:
-            t.destroy()
-        del self.tab_manager
+        self.tab_manager.destroy()
         destroy_sprite_map()
         destroy_global_data()
+        del self.tab_manager
         del self.glfw_window
 
     def paste_to_active_window(self, text):

kitty/tabs.py

@@ -285,6 +285,10 @@ class TabBar:  # {{{
         self.cell_ranges = cr
         glfw_post_empty_event()
 
+    def destroy(self):
+        self.screen.reset_callbacks()
+        del self.screen
+
     def tab_at(self, x):
         x = (x - self.window_geometry.left) // self.cell_width
         for i, (a, b) in enumerate(self.cell_ranges):
@@ -412,4 +416,11 @@ class TabManager:  # {{{
         if len(self.tabs) < 2:
             return
         self.tab_bar.render()
+
+    def destroy(self):
+        for t in self:
+            t.destroy()
+        self.tab_bar.destroy()
+        del self.tab_bar
+        del self.refresh_sprite_positions
 # }}}