Remove unused handler

src/textual/app.py

@@ -305,8 +305,6 @@ class App(Generic[ReturnType], DOMNode):
         self.stylesheet = Stylesheet(variables=self.get_css_variables())
         self._require_stylesheet_update: set[DOMNode] = set()
 
-        self._dom_lock = asyncio.Lock()
-
         css_path = css_path or self.CSS_PATH
         if css_path is not None:
             # When value(s) are supplied for CSS_PATH, we normalise them to a list of Paths.
@@ -1920,28 +1918,6 @@ class App(Generic[ReturnType], DOMNode):
         # prune event.
         return pruned_remove
 
-    async def _on_prune(self, event: events.Prune) -> None:
-        """Handle a prune event.
-
-        Args:
-            event (events.Prune): The prune event.
-        """
-
-        async def prune(event: events.Prune):
-            async with self._dom_lock:
-                try:
-                    # Prune all the widgets.
-                    for widget in event.widgets:
-                        await self._prune_node(widget)
-                finally:
-                    # Finally, flag that we're done.
-                    event.finished_flag.set()
-
-                # Flag that the layout needs refreshing.
-                self.refresh(layout=True)
-
-        asyncio.create_task(prune(event))
-
     def _walk_children(self, root: Widget) -> Iterable[list[Widget]]:
         """Walk children depth first, generating widgets and a list of their siblings.
 

src/textual/widgets/_list_view.py

@@ -85,14 +85,7 @@ class ListView(Vertical, can_focus=True, can_focus_children=False):
 
     async def clear(self) -> None:
         """Clear all items from the ListView."""
-        self.index = None
-        # await_removes = []
-        await self.query("ListItem").remove()
 
-        # for child in self.children:
-        #     await child.remove()
-        # await_removes.append(child.remove())
-        # await asyncio.gather(*await_removes)
         await self.emit(self.ChildrenUpdated(self, self.children))
 
     def action_select(self) -> None: