public static void appendTimestamp(@NotNull Project project,
                                     @NotNull InplaceCommentAppender appender,
                                     @NotNull VirtualFile file) {
    if (!UISettings.getInstance().getShowInplaceComments()) {
      return;
    }

    try {
      Long timestamp = ((IdeDocumentHistoryImpl)getInstance(project)).recentFileTimestampMap.getValue().get(file.getPath());
      if (timestamp != null) {
        appender.append(" ", SimpleTextAttributes.REGULAR_ATTRIBUTES);
        appender.append(DateFormatUtil.formatPrettyDateTime(timestamp), SimpleTextAttributes.GRAYED_SMALL_ATTRIBUTES);
      }
    }
    catch (IOException e) {
      LOG.info("Cannot get a timestamp from a persistent hash map", e);
    }
  }
public static void appendTimestamp(@NotNull Project project,
                                     @NotNull InplaceCommentAppender appender,
                                     @NotNull VirtualFile file)