private @Nullable VcsLogCellController getController(@NotNull VcsLogColumn<?> column) {
    TableColumn tableColumn = getTableColumn(column);
    if (tableColumn == null) return null;

    VcsLogCellRenderer cellRenderer = getVcsLogCellRenderer(tableColumn);
    return cellRenderer == null ? null : cellRenderer.getCellController();
  }
private @Nullable VcsLogCellController getController(@NotNull VcsLogColumn<?> column)