Comment 2 for bug 1735799

Yes, I'm defining duplicate as an entry with the same text at the same level. (I rarely try to find multiple levels using the TOC editor.)

I guess I could use the tag type, but that involves opening the full book editor. In most cases, I simply use the TOC editor stand-alone, so there's no way to see the underlying HTML tags. Also, the conversion to HTML may not be consistent, so this technique might not always work.

I think the dupe-finding logic could be quite simple. I would not want to search for dupes across the entire document. It would be sufficient to eliminate all entries that are exactly the same as the prior entry.