code: public void removeGeometry(Geometry geometry) throws GeometryMergeException {
  		if (!busy) {
  			throw new GeometryMergeException("Can't remove a geometry if no merging process is active.");
  		}
  		geometries.remove(geometry);
  		eventBus.fireEvent(new GeometryMergeRemovedEvent(geometry));
  	}
docs: Remove a geometry from the merging list again.
  
  @param geometry The geometry to remove.
  @throws GeometryMergeException In case the merging process has not been started.