private void onItemStateChange(@NotNull MyFileTypeItem currItem, boolean isSelected) {
    if (currItem.isGroupItem()) {
      myItems.stream()
             .filter(subItem -> subItem.mySuperType == currItem.myFileType)
             .forEach(subItem -> subItem.setSelected(isSelected));
    }
    else if (currItem.mySuperType != null) {
      for (MyFileTypeItem item : myItems) {
        if (item.myFileType == currItem.mySuperType) {
          item.setState(getSuperItemState(currItem));
          break;
        }
      }
    }
  }
private void onItemStateChange(@NotNull MyFileTypeItem currItem, boolean isSelected)