Enhancement request: when an epub 3 has a nav.xhtml could Modify ePub generate the epub 2 toc.ncx from it? Sigil has this in its Tools>Epub 3 Tools menu. I keep getting epub 3 books that don't have a toc.ncx and I'd like to be able to simply click a button in calibre to fix that rather than having to open them in Sigil. (Typically I've already cleaned up/fixed their CSS in Sigil but forgot to generate the toc.ncx.) The kobo doesn't display a TOC when there isn't a toc.ncx.
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