@Override
  public Object getData(@NotNull @NonNls String dataId) {
    if (PlatformCoreDataKeys.BGT_DATA_PROVIDER.is(dataId)) {
      Object selection =
        myPsiTree.hasFocus() ? TreeUtil.getLastUserObject(myPsiTree.getSelectionPath()) :
        myRefs.hasFocus() ? myRefs.getSelectedValue() : null;
      return selection == null ? null : (DataProvider)slowId -> getSlowData(slowId, selection);
    }
    return null;
  }
@Override
  public Object getData(@NotNull @NonNls String dataId)