code: @Deprecated
  	public void setFilter(String serverLayerId, String filter) {
  		addLayerWithFilter(serverLayerId, serverLayerId, filter);
  	}
docs: Set the filter expression which should be applied on the given server layer. If there has already been specified
  a filter for that server layer, it will be overwritten.
  <p/>
  If the filter contains a geometry, then this needs to be in layer CRS, it is not converted!
  
  @param serverLayerId server layer to set this filter on
  @param filter filter expression
  
  @deprecated use {@link #addLayerWithFilter(String, String, String)}.
  @since 1.9.0