for (;;)
{
- if ((insert_position == m_root.end()) || (invert_sense ^ (insert_position->m_z_position > root->m_z_position)))
+ if ((insert_position == m_root.end()) || (invert_sense ^ (insert_position->m_z_position < root->m_z_position)))
{
m_root.insert(insert_position, root);
break;