[bugfix][adaptivity] Remove isNew markers on ALL levels

When global refining not all isNew markers were removed. This also caused a bug when mixing growth and adaptivity as the isNew marker is also used for newly added elements through growth.

If merged this needs to be backported to the 2.4 release branch!

dune/foamgrid/foamgrid/foamgrid.cc

@@ -319,13 +319,15 @@ void Dune::FoamGrid<dimgrid, dimworld>::postAdapt()
   willCoarsen=false;
 
   // Loop over all leaf entities and remove the isNew Marker.
-  for (const auto& element : elements(this->leafGridView()))
+  for (int level = maxLevel(); level >= 0; --level)
   {
-    FoamGridEntityImp<dimgrid, dimgrid, dimworld>& e = *const_cast<FoamGridEntityImp<dimgrid, dimgrid, dimworld>*>(this->getRealImplementation(element).target_);
-    e.isNew_=false;
-    assert(!e.willVanish_);
-    if (e.father_)
-      e.father_->markState_=FoamGridEntityImp<dimgrid, dimgrid, dimworld>::DO_NOTHING;
+    for(auto eIt = std::get<dimgrid>(entityImps_[level]).begin(); eIt != std::get<dimgrid>(entityImps_[level]).end(); ++eIt)
+    {
+      eIt->isNew_=false;
+      assert(!eIt->willVanish_);
+      if (eIt->father_)
+        eIt->father_->markState_=FoamGridEntityImp<dimgrid, dimgrid, dimworld>::DO_NOTHING;
+    }
   }
 }