Fix scroll event passthrough in Stack widget

widget/src/stack.rs

@@ -209,19 +209,23 @@ where
  tree: &mut Tree,
  event: Event,
  layout: Layout<'_>,
- cursor: mouse::Cursor,
+ mut cursor: mouse::Cursor,
  renderer: &Renderer,
  clipboard: &mut dyn Clipboard,
  shell: &mut Shell<'_, Message>,
  viewport: &Rectangle,
  ) -> event::Status {
+ let is_over_scroll =
+ matches!(event, Event::Mouse(mouse::Event::WheelScrolled { .. }))
+ && cursor.is_over(layout.bounds());
+
  self.children
  .iter_mut()
  .rev()
  .zip(tree.children.iter_mut().rev())
  .zip(layout.children().rev())
  .map(|((child, state), layout)| {
- child.as_widget_mut().on_event(
+ let status = child.as_widget_mut().on_event(
  state,
  event.clone(),
  layout,
@@ -230,7 +234,19 @@ where
  clipboard,
  shell,
  viewport,
- )
+ );
+
+ if is_over_scroll {
+ let interaction = child.as_widget().mouse_interaction(
+ state, layout, cursor, viewport, renderer,
+ );
+
+ if interaction != mouse::Interaction::None {
+ cursor = mouse::Cursor::Unavailable;
+ }
+ }
+
+ status
  })
  .find(|&status| status == event::Status::Captured)
  .unwrap_or(event::Status::Ignored)
@@ -283,9 +299,9 @@ where
  interaction != mouse::Interaction::None
  })
  .map(|i| self.children.len() - i - 1)
- .unwrap_or(self.children.len())
+ .unwrap_or_default()
  } else {
- self.children.len()
+ 0
  };
 
  let mut layers = self