@Nullable
  @Override
  public Object getData(@NotNull @NonNls String dataId) {
    if (DiffDataKeys.CURRENT_CONTENT.is(dataId)) {
      return getCurrentSide().select(myRequest.getContents());
    }
    else if (DiffDataKeys.DIFF_VIEWER.is(dataId)) {
      return this;
    }
    else if (DiffDataKeys.DIFF_CONTEXT.is(dataId)) {
      return myContext;
    }
    return super.getData(dataId);
  }
@Nullable
  @Override
  public Object getData(@NotNull @NonNls String dataId)