message: Remove maximized when split occurs
diff: @@ -160,6 +160,7 @@ impl<T> State<T> {
  node.split(new_split, axis, new_pane);
  let _ = self.panes.insert(new_pane, state);
  + let _ = self.maximized.take();
  Some((new_pane, new_split))
  }
  