Visualize superposed shapes in Topography Editor

At the moment, if there are sources or targets (or obstacles) that are superposed, it is not visible to the user. If the sources have different attributes, this may lead to very surprising simulation results or problems. In the case of obstacles, it is not clear if superposed obstacles are more repulsive as a single one. Consequently, it would be good to visualize superposed shapes. Maybe this could be illustrated by hatching the area.