@Override
  public void goPrev() {
    List<? extends T> changes = getChanges();
    int line = getEditor().getCaretModel().getLogicalPosition().line;

    T prev = null;
    for (int i = 0; i < changes.size(); i++) {
      T change = changes.get(i);

      T next = i < changes.size() - 1 ? changes.get(i + 1) : null;
      if (next == null || getEndLine(next) > line || getStartLine(next) >= line) {
        prev = change;
        break;
      }
    }

    assert prev != null;
    scrollToChangeUnderCommand(prev);
  }
@Override
  public void goPrev()