Function _isRootLevelItem

Engine/source/gui/controls/guiTreeViewCtrl.h:461–464

      virtual bool isValidDragTarget( Item* item );
      
      bool _isRootLevelItem( Item* item ) const
      {
         return ( item == mRoot && mShowRoot ) || ( item->mParent == mRoot && !mShowRoot );
      }

      /// For inspector tree views, this is hooked to the SetModificationSignal of sets
      /// so that the tree view knows when it needs to refresh.