grade items set as extra credit when category changed to natural from weighted mean

Preparation Enable all the aggregation methods (grade_aggregations_visible) Set the default aggregation method to "natural" Create a course Add several grade categories of each aggregation methods Add several grade items to different categories with different values (weight, extra credit) Moving grade items between categories Make sure that moving items between categories keep remain extra credit items if the aggregation method supports it Make sure that the weights are always reset, except when switching to a category supporting the same aggregation method. Changing aggregation method Make sure that after changing an aggregation method the extra credit items remain extra credit if the aggregation supports it Make sure that the weights are reset