code: public boolean onLongClickCheckable(@NonNull View view,
                                          @NonNull CheckableViewHolder viewHolder) {
          if (MODE_NEW_FILE == mode) {
              mEditTextFileName.setText(getName(viewHolder.file));
          }
          onClickCheckBox(viewHolder);
          return true;
      }
docs: Long clicking a selectable item should toggle its selected state. Note that if only a
  single item can be selected, then other potentially selected views on screen must be
  de-selected.
  
  @param view       which was long clicked. Not used in default implementation.
  @param viewHolder for the clicked view
  @return true if the callback consumed the long click, false otherwise.