@Override
  public boolean shouldPreviewUsages(ChangeInfo changeInfo, UsageInfo[] usages) {
    if (!StringUtil.isJavaIdentifier(changeInfo.getNewName())) return true;

    for (UsageInfo usage : usages) {
      if (usage instanceof GrMethodCallUsageInfo) {
        if (((GrMethodCallUsageInfo)usage).isPossibleUsage()) return true;
      }
    }
    return false;
  }
@Override
  public boolean shouldPreviewUsages(ChangeInfo changeInfo, UsageInfo[] usages)