bug#64516: [PATCH] docview: Only enable imenu when supported

[Tassilo Horn]

Morgan Smith <Morgan.J.Smith@outlook.com> writes:

Hi Morgan,

>> my reasoning was to have an explanation in the *Messages* buffer for
>> people who ask themselves "where the heck is the Outline menu item"?
>
> I didn't think of users using the toolbar.

I've heared there are three of them.  But we are talking about the menu
bar of which there are a good dozen users. :-)

> I think you can go ahead and use the patch you sent a couple emails
> back.  I'm happy with that one.

Alright, I've amended your patch with my slight modifications.  Eli,
feel free to "git am" it where you see fit.  It should apply both on
master and on emacs-29.

Thanks,
Tassilo

0001-docview-imenu-check-return-value-of-mutool.patch
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