Fixing landuse overlap

If you zoom out enough in JOSM, you will find way https://www.openstreetmap.org/way/436800951#map=12/4.2834/-52.0013 that represents the surrounding forest.

I doubt you can do that in iD.

Your last comment indicates that you are interested in a general/algorithmic solution of the issue. With a high probability you will not find any editors with such function. There are many reasons to that. The outer polygon might be very large, the lake polygon is over the borders of several neighbouring larger forest polygons, then the opposite – a forest polygon over a lake or river polygon, a generalized case of the former cases, just to mention some. But it is not the end. Assume there was a hole under the lake in your example but the borders do not coincide. So, the problem starts long before we come to the issue you have met.
While in the raster image based map-making the issue is almost irrelevant the situation is quite different in the modern GIS and digital cartography. There, users should (and they do) have functions that resolve the mentioned issues. These issues were several times up to discussion on some OSM forums and I have also presented a possible solution in the articles here https://lists.openstreetmap.org/pipermail/talk/2017-March/077710.html and here https://lists.openstreetmap.org/pipermail/talk/2017-April/077824.html. The first one contains some theoretical hints. The second one is a complete demonstration example using forest and other necessary OSM data from Japan. Some people would naively like to have such complex issue described in several sentences what is impossible. So, if you have patience read them and have a special focus on the Japanese forests examples. There you have a full answer to your question.