[ISSUE] there is a horizontal line in middle of text-property displayed image?

[Christopher M. Miles]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: "Christopher M. Miles" <numbchild@gmail.com>
>> Date: Mon, 12 Sep 2022 08:54:11 +0800
>> 
>> Question: As the email subject said.
>
> Does this happen with any image file?  If not, can you post the file
> with which it happens, or tell where one can download it?

It happens on all images which I using text-property to display that is
from Emacs package "org-link-beautify" https://repo.or.cz/org-link-beautify.git.

This package will generate and display a thumbnail image for org-mode
file: link of a video file.

>
> If it happens with any image file, does it happen in "emacs -Q"?
>

It happens in "emacs -Q" too. Here is the screenshot show the original
image has no horizontal center line. But in Emacs displayed has a line.

> I tried to reproduce this with some random image file, but didn't see
> any such center-line.

Not image file, I use org-mode's command ~org-toggle-inline-images~ to
display image links are also fine has no center-line. But images
displayed in text-property has center-line. *NOTE*: happens on
text-property displayed images.

#+begin_src emacs-lisp
(put-text-property start end
                   'display (create-image thumbnail nil nil :ascent 'center 
:max-height thumbnail-size))
#+end_src

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