private static void fixSeparators(@NotNull Document document) {
    ApplicationManager.getApplication().runWriteAction(() -> {
      int i = 1;
      while(i < document.getLineCount()) {
        final int start = document.getLineEndOffset(i);
        final int end = document.getLineEndOffset(i) + document.getLineSeparatorLength(i);
        document.deleteString(start, end);
        i++;
      }
    });
  }
private static void fixSeparators(@NotNull Document document)