docs: public void setCollapsedColumns(Object... collapsedColumns) {
  
          Set<Object> collapsedSet = Sets.newHashSet();
          for (Object collapsed : collapsedColumns) {
              collapsedSet.add(collapsed);
          }
          for (Object key : m_fileTable.getVisibleColumns()) {
              m_fileTable.setColumnCollapsed(key, collapsedSet.contains(key));
          }
      }