message: Implement `Widget::mouse_interaction` for `Scrollable`
diff: @@ -419,6 +419,45 @@ where
  event::Status::Ignored
  }
  + fn mouse_interaction(
  + &self,
  + layout: Layout<'_>,
  + _viewport: &Rectangle,
  + cursor_position: Point,
  + ) -> mouse::Interaction {
  + let bounds = layout.bounds();
  + let content_layout = layout.children().next().unwrap();
  + let content_bounds = content_layout.bounds();
  + let scrollbar = self.scrollbar(bounds, content_bounds);
  +
  + let is_mouse_over = bounds.contains(cursor_position);
  + let is_mouse_over_scrollbar = scrollbar
  + .as_ref()
  + .map(|scrollbar| scrollbar.is_mouse_over(cursor_position))
  + .unwrap_or(false);
  +
  + if is_mouse_over_scrollbar || self.state.is_scroller_grabbed() {
  + mouse::Interaction::Idle
  + } else {
  + let offset = self.state.offset(bounds, content_bounds);
  +
  + let cursor_position = if is_mouse_over && !is_mouse_over_scrollbar {
  + Point::new(cursor_position.x, cursor_position.y + offset as f32)
  + } else {
  + Point::new(cursor_position.x, -1.0)
  + };
  +
  + self.content.mouse_interaction(
  + content_layout,
  + &Rectangle {
  + y: bounds.y + offset as f32,
  + ..bounds
  + },
  + cursor_position,
  + )
  + }
  + }
  +
  fn draw(
  &self,
  renderer: &mut Renderer,
  