I assumed you had removed the old toc from the document first and just wanted to hide one other file. The epub2 guide items allow only one true toc not multiple.
That said, should an index ever index front matter? Are dedications ever indexed? Perhaps we should modify Sigil to skip all guide types that map to any type of front matter? That could be easily done.
What is the right/official thing to do here? Should all front matter be excluded by an index generator or not?
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