skip invisible widgets, update lines on mount for option list

src/textual/widget.py

@@ -2410,7 +2410,6 @@ def _scroll_to(
         Returns:
             `True` if the scroll position changed, otherwise `False`.
         """
-
         maybe_scroll_x = x is not None and (self.allow_horizontal_scroll or force)
         maybe_scroll_y = y is not None and (self.allow_vertical_scroll or force)
         scrolled_x = scrolled_y = False
@@ -3200,6 +3199,9 @@ def scroll_to_widget(
         region = widget.virtual_region_with_margin
         scrolled = False
 
+        if not region.size:
+            return False
+
         while isinstance(widget.parent, Widget) and widget is not self:
             container = widget.parent
             if widget.styles.dock != "none":

src/textual/widgets/_option_list.py

@@ -652,6 +652,9 @@ def _on_resize(self):
     def on_show(self) -> None:
         self.scroll_to_highlight()
 
+    def on_mount(self) -> None:
+        self._update_lines()
+
     async def _on_click(self, event: events.Click) -> None:
         """React to the mouse being clicked on an item.