- const int extra_scroll_height = (extents.second - extents.first) / 4;
- verticalScrollBar()->setRange(extents.first - extra_scroll_height,
- extents.first + extra_scroll_height);
+ verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
+ extents.second - (areaSize.height() / 2));