//is only called when CC not connected => m_eTreeArray is initialized
void PlanRepInc::deleteTreeConnection(int i, int j, CombinatorialEmbedding &E)
{
edge e = m_eTreeArray(i, j);
if (e == nullptr) return;
edge nexte = nullptr;
OGDF_ASSERT(e);
OGDF_ASSERT(m_treeEdge[e]);
//we have to take care of treeConnection edges that
//are already crossed
while ((e->target()->degree() == 4) &&
m_treeEdge[e->adjTarget()->cyclicSucc()->cyclicSucc()->theEdge()])
{
nexte = e->adjTarget()->cyclicSucc()->cyclicSucc()->theEdge();
OGDF_ASSERT(original(nexte) == 0)
E.joinFaces(e);
e = nexte;
}
E.joinFaces(e);
m_eTreeArray(i, j) = nullptr;
m_eTreeArray(j, i) = nullptr;
OGDF_ASSERT(isConnected(*this));
}//deleteTreeConnection
