@NotNull
    private static String getFileName(@NotNull DiffContent content,
                                      @Nullable String title,
                                      @Nullable String windowTitle) {
      if (content instanceof EmptyContent) {
        return "no_content.tmp";
      }

      String fileName = content.getUserData(DiffUserDataKeysEx.FILE_NAME);

      if (fileName == null && content instanceof DocumentContent) {
        VirtualFile highlightFile = ((DocumentContent)content).getHighlightFile();
        fileName = highlightFile != null ? highlightFile.getName() : null;
      }

      if (fileName == null && content instanceof FileContent) {
        fileName = ((FileContent)content).getFile().getName();
      }

      if (!StringUtil.isEmptyOrSpaces(fileName)) {
        return fileName;
      }


      FileType fileType = content.getContentType();
      String ext = fileType != null ? fileType.getDefaultExtension() : null;
      if (StringUtil.isEmptyOrSpaces(ext)) ext = "tmp";

      String name = "";
      if (title != null && windowTitle != null) {
        name = title + "_" + windowTitle;
      }
      else if (title != null || windowTitle != null) {
        name = title != null ? title : windowTitle;
      }
      if (name.length() > 50) name = name.substring(0, 50);

      return PathUtil.suggestFileName(name + "." + ext, true, false);
    }
@NotNull
    private static String getFileName(@NotNull DiffContent content,
                                      @Nullable String title,
                                      @Nullable String windowTitle)