scroll to 0,0 on clear options

Author: willmcgugan

src/textual/widgets/_option_list.py

@@ -311,6 +311,8 @@ def clear_options(self) -> Self:
         self._option_to_index.clear()
         self.highlighted = None
         self.refresh()
+        self.scroll_to(0, 0, animate=False)
+        self._update_lines()
         return self
 
     def add_options(self, new_options: Iterable[OptionListContent]) -> Self: