docs: void adjustScroll() {
  
          iTreeHeight = iRowHeight * (iRowCount + 1);
  
          // correct would be iMaxTextLength + iMaxIndent*iIndentWidth
          iTreeWidth = iMaxTextLength * 2;
  
          sbHoriz.setValues(iX, iWidth, 0, iTreeWidth);
  
          int v = iY / iRowHeight,
              h = iHeight / iRowHeight;
  
          sbVert.setValues(v, h, 0, iRowCount + 1);
  
          iX = sbHoriz.getValue();
          iY = iRowHeight * sbVert.getValue();
      }