+ const int x = view->hover_point().x();
+
+ if (x == -1)
+ return;
+
+ p.setPen(QPen(QColor(Qt::lightGray)));
+
+ const pair<int, int> extents = v_extents();
+
+ p.setRenderHint(QPainter::Antialiasing, false);
+ p.drawLine(x, get_visual_y() + extents.first,
+ x, get_visual_y() + extents.second);
+ p.setRenderHint(QPainter::Antialiasing, true);