Ihor Radchenko <yantar92@gmail.com> writes:

> "Christopher M. Miles" <numbchild@gmail.com> writes:
>
>> I replaced step 5 with step 6 by extracting the logic code of
>> org-link-beautify, but I found it does not have center-line. That's
>> really weird.
>> ...
>>        (put-text-property
>>         start end
>>         'display (create-image "~/Downloads/.thumbnails/3veEPJrQrV1EtpH9.png" nil nil :ascent 'center :max-height 512))
>>        (make-local-variable 'image-map)
>>        (define-key image-map (kbd "<mouse-1>") 'org-open-at-point))
>>      #+end_src
>
> On my side, the put-text-property does have center-line.
> But only when buffer is in Org mode.
> Yet, it is not Org's fault.
>
> The reason you are seeing the horizontal line is org-link face.
> org-link has underline. And the "center" line you are seeing is actually
> underline coming from the face. I'd say it is emacs bug.

Thanks very much for figuring out this issue, Ihor.

I see, I originally post this issue on Emacs-help mailing list, Eli let
me forward this thread to Org mode mailing list. Now I need to forward
to Emacs-devel mailing list.

In case the background info is missing, link original message here:

https://list.orgmode.org/87mtae2718.fsf@localhost/T/#m35d40f37fdf80f413ddb8d40e3017a6f102651e9

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