Polish the EditableTreeModel example

- Fix/silence most clang-tidy/compiler warnings
  * unsigned/int comparison
  * Avoid repeating return / default parameter types
  * Use auto * for pointers
  * Streamline code, use ternary operators
  * Move constructor parameters
  * Observe rule of 5 by using Q_DISABLE_COPY_MOVE
- Add some bells && whistles, resize properly, expand all

Change-Id: I1721458ff66dcba123ff3a2cf50e7d15387a4e8b
Reviewed-by: Kai Köhne <kai.koehne@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/widgets/itemviews/editabletreemodel/treeitem.h b/examples/widgets/itemviews/editabletreemodel/treeitem.h
index d30047dd2a..8910312ade 100644
--- a/examples/widgets/itemviews/editabletreemodel/treeitem.h
+++ b/examples/widgets/itemviews/editabletreemodel/treeitem.h
@@ -11,7 +11,7 @@
 class TreeItem
 {
 public:
-    explicit TreeItem(const QVariantList &data, TreeItem *parent = nullptr);
+    explicit TreeItem(QVariantList data, TreeItem *parent = nullptr);
 
     TreeItem *child(int number);
     int childCount() const;