bug#69384: 30.0.50; :align-to and bidi-paragraph-direction interaction

[Eli Zaretskii]

> Cc: 69384@debbugs.gnu.org
> Date: Sun, 25 Feb 2024 19:35:22 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > Sorry for not being clearer in my report: the bug is the broken shaping
> > with the combination of setting bidi-paragraph-direction and using
> > :align-to
> 
> OK, I will look into that when I have time.

It's a relatively recent regression on the master branch, caused by
yours truly.  I hope I've fixed it now.