void insertSubTree(const QModelIndex &source_idx, bool emitInsert = true);
SourceItem *insertSubTreeHelper(SourceItem *parentItem, SourceItem *lastItem_, const QModelIndex &source_idx);
void insertSubTree(const QModelIndex &source_idx, bool emitInsert = true);
SourceItem *insertSubTreeHelper(SourceItem *parentItem, SourceItem *lastItem_, const QModelIndex &source_idx);