[md][bugfix] Multidomain simuluation need to update the coupling maanger when solution changes

dumux/multidomain/newtonsolver.hh

@@ -153,6 +153,16 @@ public:
         couplingManager_->updateSolution(Backend::dofs(varsCurrentIter));
     }
 
+protected:
+    /*!
+     * \brief Update solution-depended quantities like grid variables after the solution has changed.
+     */
+    void solutionChanged_(const SolutionVector &uCurrentIter) override
+    {
+        couplingManager_->updateSolution(uCurrentIter);
+        this->assembler().updateGridVariables(uCurrentIter);
+    }
+
 private:
 
     /*!