Merge branch 'fix/newton-linesearch-update' into 'master'

[newton] Fixup solution reset in line search update after !2291

See merge request !2532

dumux/nonlinear/newtonsolver.hh

@@ -1121,6 +1121,7 @@ private:
 
             // try with a smaller update and reset solution
             lambda *= 0.5;
+            uCurrentIter = uLastIter;
         }
     }