message: Introduce `splits` method in `pane_grid::Node`
diff: @@ -43,6 +43,30 @@ pub enum Node {
  }
  impl Node {
  + /// Returns an iterator over each [`Split`] in this [`Node`].
  + ///
  + /// [`Split`]: struct.Split.html
  + /// [`Node`]: enum.Node.html
  + pub fn splits(&self) -> impl Iterator<Item = &Split> {
  + let mut unvisited_nodes = vec![self];
  +
  + std::iter::from_fn(move || {
  + while let Some(node) = unvisited_nodes.pop() {
  + match node {
  + Node::Split { id, a, b, .. } => {
  + unvisited_nodes.push(a);
  + unvisited_nodes.push(b);
  +
  + return Some(id);
  + }
  + _ => {}
  + }
  + }
  +
  + None
  + })
  + }
  +
  /// Returns the rectangular region for each [`Pane`] in the [`Node`] given
  /// the spacing between panes and the total available space.
  ///
  