bug#52156: 29.0.50; Display property plus strike-through doesn't work

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sat, 27 Nov 2021 22:00:03 -0800
> 
> The following code doesn't produce a thin line across the window anymore. I 
> don’t see anything suspicious in the repository. 
> 
> (progn
>   (switch-to-buffer (get-buffer-create "test"))
>   (font-lock-mode -1)
>   (insert (propertize "-" 'display '(space :width text)
>                       'face '(:strike-through t))))

I cannot reproduce this in "emacs -Q" with the latest master branch: I
see the expected thin line.

If you go to the BOB (M-<) in the created buffer, and type
"M-x describe-text-properties RET", what does Emacs show in
the buffer it pops up?

Also, please see if the problem has anything to do with
cursor blinking (or not blinking), or with cursor
position relative to that line.