bug#70128: Issue after upgrading ELPA-auctex 14.0.4

[Ikumi Keita]

Hi Angelo,

>>>>> Angelo Graziosi via bug-auctex via Bug reporting list for AUCTeX 
>>>>> <bug-auctex@gnu.org> writes:
> The following happens on Windows 10 64 and Emacs 29.3-1 installed from
> MSYS2/UCRT64 (mingw-w64-ucrt-x86_64-emacs 29.3-1, released/built with
> native compilation )

> When one starts Emacs it prints in Messages and minibuffer:

> imenu-default-create-index-function: Invalid (or missing) doc string
> ("c:/Users/utente/AppData/Roaming/.emacs.d/elpa/auctex-14.0.4/tex.elc"
> . 301409)

I don't understand why this error occurred, but this entry in CHANGES
entry may be related:
,----
|         − If your Emacs is 29 or newer and you use ‘desktop.el’ to save
|           and restore Emacs sessions, be careful before you update
|           AUCTeX; You should attempt to update only after
|             1. you kill all buffer under former AUCTeX modes which have
|                overlapped name with Emacs built-in TeX modes, and
|             2. you terminate the current Emacs session.
|           The modes with such overlapped name are ‘plain-tex-mode’,
|           ‘latex-mode’, ‘doctex-mode’ and ‘texinfo-mode’.  (The above
|           prescription ensures no buffer of such modes is recorded in
|           the desktop file.  Otherwise those buffers would be restored
|           in the built-in modes, not AUCTeX modes, after the update of
|           AUCTeX.)
`----
If emacs tried to restore the buffer in the built-in latex-mode,
something inconsistent which led to the reported error could happen...?

> After this the desktop file is "emptied": restarting Emacs all buffers
> of the desktop file are lost (I have lost about 50 of them :-( )

Sorry for that. 😣

Regards,
Ikumi Keita
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