message: Simplify `is_picked` expression in `pane_grid`
diff: @@ -458,11 +458,7 @@ where
  .iter_mut()
  .zip(layout.children())
  .map(|((pane, content), layout)| {
  - let is_picked = if let Some(picked_pane) = picked_pane {
  - picked_pane == *pane
  - } else {
  - false
  - };
  + let is_picked = picked_pane == Some(*pane);
  content.on_event(
  event.clone(),
  