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I know that there is RefTeX with its TOC, and I know how to include \frametitle there (see here). Nevertheless, I would like to see \frametitle also appear in imenu. What would be the minimal way to get to this?

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Try this

(push '("frametitle" 2) TeX-outline-extra)

See the documentation for TeX-outline-extra. The first element of the list being added is a regexp and the second is the imenu level. You can also see LaTeX-section-list for the default levels that imenu uses for latex.

Update:

As suggested in the comments, it might be a little safer to use the following. This change makes no difference for my use though. 

(push '("\\\\frametitle\\b" 2) TeX-outline-extra)
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    AUCTeX manual also says: A ‘^’ is automatically prepended to the regular expressions in the list, so they must match text at the beginning of the line. Hence, I suggest you do (add-to-list 'TeX-outline-extra '("\\\\frametitle\\b" 7)).
    – Arash Esbati
    Commented Dec 20, 2016 at 8:34
  • That may be what it says, but that's not the regexp that is actually used. See the LaTeX-outline-regexp function. In any case, your regexp will prevent matching against something like \AframetitleA{} so I updated it. Thanks
    – justbur
    Commented Dec 20, 2016 at 13:38

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