dy = down_skyline.distance (skylines[j][-stacking_dir]);
}
+ if (isinf (dy)) /* if the skyline is empty, maybe max_height is infinity_f */
+ dy = 0.0;
+
dy = max (0.0, dy + padding + extra_space / elems.size ());
down_skyline.raise (-stacking_dir * dy);
where += stacking_dir * dy;