Remove boundary deletion upon child boundary transfer.

src/mesh/boundary_info.C

@@ -1890,16 +1890,9 @@ BoundaryInfo::transfer_boundary_ids_from_children(const Elem * const parent)
     // This is where the decision is made. If 50% of the children have the tags,
     // we propagate them upwards upon coarsening. Otherwise, they are deleted.
     for (const auto & boundary : boundary_counts)
-    {
       if (boundary.second / number_of_sides_on_children > 0.5)
         this->add_side(parent, side_i, boundary.first);
-      else
-        this->remove_side(parent, side_i, boundary.first);
-    }
   }
-
-  for (const auto & child_i : make_range(parent->n_children()))
-    this->remove(parent->child_ptr(child_i));
 }
 
 std::size_t BoundaryInfo::n_boundary_conds () const

tests/mesh/boundary_info.C

@@ -560,6 +560,8 @@ public:
       if (c(0) < 1)
       {
         CPPUNIT_ASSERT(bi.has_boundary_id(elem, 1, 5));
+        // We clean this boundary for the next round of tests
+        bi.remove_side(elem, 1, 5);
         // we will refine this element again
         elem->set_refinement_flag(Elem::REFINE);
       }