Extend tree in tree-view example to reveal bug

Author: japhb

examples/tree-view.raku

@@ -9,7 +9,13 @@ use Terminal::Widgets::SpanWrappingAndHighlighting;
 class TreeViewDemo is TopLevel {
     has $!root-node = tv-node('Root',
                               tv-node('One',
-                                      tv-node('One One'),
+                                      tv-node('One One',
+                                              tv-node('One One One'),
+                                              tv-node('One One Two'),
+                                              tv-node('One One Three'),
+                                              tv-node('One One Four'),
+                                              tv-node('One One Five'),
+                                              tv-node('One One Six')),
                                       tv-node('One Two',
                                               tv-node('One Two One'),
                                               tv-node('One Two Two'),