+ // If an item is being dragged, update the stacking
+ TraceTreeItemOwner *item_owner = nullptr;
+ const vector< shared_ptr<TraceTreeItem> > trace_tree_items(
+ view_.list_by_type<TraceTreeItem>());
+ for (shared_ptr<TraceTreeItem> i : trace_tree_items)
+ if (i->dragging())
+ item_owner = i->owner();
+