@Override
                public void done(IJobChangeEvent event) {
                    synchronized (ObjectListControl.this) {
                        if (lazyObjects == null || lazyObjects.isEmpty()) {
                            lazyLoadingJob = null;
                        } else {
                            lazyLoadingJob.schedule(LAZY_LOAD_DELAY);
                        }
                    }
                }
Used to save/load columns configuration.
Must depend on object types

@param classList classes of objects in the list
plugins/org.jkiss.dbeaver.ui.navigator/src/org/jkiss/dbeaver/ui/navigator/itemlist/ObjectListControl.java