setSelectAll method
Sets the selection state of all nodes.
Implementation
void setSelectAll(bool isSelected) {
  setState(() {
    _setAllNodesSelection(isSelected);
    _updateSelectAllState();
  });
  _notifySelectionChanged();
}Sets the selection state of all nodes.
void setSelectAll(bool isSelected) {
  setState(() {
    _setAllNodesSelection(isSelected);
    _updateSelectAllState();
  });
  _notifySelectionChanged();
}