bug#65896: 30.0.50; folding text with text properties prevents background from extending past the newline

[Eli Zaretskii]

> From: StrawberryTea <look@strawberrytea.xyz>
> Cc: Ihor Radchenko <yantar92@posteo.net>, 65896@debbugs.gnu.org,
>  kevin.legouguec@gmail.com
> Date: Sun, 24 Sep 2023 13:30:33 -0500
> 
> But I’m thinking that we should be able to fontify the ellipsis without extend
> and the heading with the extend property should override the background of the
> other faces on the same line (even the ellipsis).

Please keep in mind that AFAIR the way the display engine is
implemented, the ellipsis is displayed with the face of the preceding
visible text, ignoring the face of the invisible text for which it
stands.