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

[Morgan Smith]

Hello,

Tassilo Horn <tsdh@gnu.org> writes:

>
> I couldn't test it because all epub files I found result in
>
>   imenu unavailable: "No items suitable for an index found in this buffer"
>
> and not the described error.

I feel like my reviewers often can't reproduce my errors.  I'm running
Emacs from a very recent commit and I have mutool installed.  I really
feel like the error should be reproducible for anyone that meets those
two requirements.  Do I need to include more information in my bug
reports?  If so, what information?


Anyways I modified my patch with Tassilo's feedback.  However, I
realized that it partially reverts commit
b23e062d7463b76d25dfd9ba4a80c1848a448e42

0001-docview-imenu-check-return-value-of-mutool.patch
Description: Text Data

I can't really seem to figure out why we call 'doc-view--pdf-outline' in
doc-view-imenu-setup even after reading the two bug reports that are
linked in the commit message.  For this reason I CC'd jao