fixed ListView (src/textual/widgets/_list_view.py): clear stuck hover state during scrollbar drag

src/textual/widgets/_list_item.py

@@ -35,5 +35,7 @@ def watch_highlighted(self, value: bool) -> None:
     @on(events.Enter)
     @on(events.Leave)
     def on_enter_or_leave(self, event: events.Enter | events.Leave) -> None:
+        """Remove mouse hover when dragging the scrollbar"""
         event.stop()
-        self.set_class(self.is_mouse_over, "-hovered")
+        mouse_captured = self.app.mouse_captured is not None
+        self.set_class(self.is_mouse_over and not mouse_captured, "-hovered")

src/textual/widgets/_list_view.py

@@ -393,4 +393,4 @@ def _on_list_item__child_clicked(self, event: ListItem._ChildClicked) -> None:
 
     def __len__(self) -> int:
         """Compute the length (in number of items) of the list view."""
-        return len(self._nodes)
+        return len(self._nodes)